Okay here we go. I had a bad maf for a year and I finally changed it and the burnoff. After I did the changes when I stab the throttle I get no power I can't even break the tires loose. The motor is a 5.7 tpi. One more thing I put a new tps on about 6 months ago but I never adjusted it. The car idles and revs just how it should I just have the power of a moped.

 

Did you melt the cat with all that bad running prior to fixing the MAF and TPS? Acts like you have a banana in the tailpipe when you do that.

I'd check the TPS readings first to confirm they are within spec. I'd also confirm the base ignition timing using factory timing procedure. And then I'd consider that the cat has melted down internally and caused a serious exhaust restriction.

An exhaust restriction (if not completely plugged) will start and idle normally. It will also drive normally under very light throttle. But when you dig deeper it's got nothing. And when you floor it there will be a point in the RPM range where it just STOPS revving any higher, starts popping and surging and generally telling you "I'm done now." Let off the gas, however, and it returns to running "normally." Then engine will also be able to free-rev in neutral fairly normally.

If those symptoms describe the problem you are experiencing that would point to an exhaust restriction (melted cat). If that DOESN'T sound very close to what you are experiencing then the problem is elsewhere.

 

I agree it could be a convertor problem but before I changed the maf sensor the car would idle high but would run like tpi on steroids. The car actually had more power two days ago when the bad maf was on the car. Right after the new maf was put on the no power symptom showed up immediatly. I took the car for a drive and floored it all I got was high rev and my tranny didn't want to come out of low and when it finally did it shifted hard(never did that with the old maf) now under light load the car runs and drives fine. I'm no dumby but I'm kinda stumped on this one

 

That is weird. As a test unplug the MAF and see how it runs. The check engine light will come on, obviously, but if that's the problem it should return to more or less normal power.

 

That's how I had to run the car with bad maf. I had to leave it unplugged to run when it was plugged in it didn't start. But I will try to unplug the new maf and see what I get

 

I unplugged the new maf and the idle increased only on start up then steadily decreased to around 800 and it ran like horse manure it backfired and bogged down under normal driving conditions. So I plugged the maf back in and she idled fine drove good etc etc....but under any type of hard acceleration it falls flat on its face. And yes I have checked the obvious vaccum,timing,gaskets,fuel pump you know all the things I'm supposed to check.

 

So when it was plugged in it wouldnt start? If thats the case mine did the same thing and it turned out I had wired it wrong, twice! I took it nto O'Reillys and one of the guys there was able to correctly wire it for ma and it now runs amazing (except for the miss).

Did you buy the right plug? Is it wired correctly?

 

With the old maf I had to leave it unplugged for the car to run. But you make a good point about the plug I did have to buy a maf pigtail part number ec83 from napa. The wires for that plug were different colors than the wires coming off the ecm harness. Now I assumed they were in the same order as the old plug that I cut off so that's how I wired the new plug up. If I wired the plug wrong wouldn't the ecm throw a code for a faulty maf sensor.

 

Might be time to buy a scanner and see what the ECM is seeing.

Although, a choked off cat will act similar to that. Not totally plugged, but a serious restriction will run normal at light throttle but putt and pop with no power on heavy throttle. Still, it's odd that it would suddenly start doing that the minute you install the new MAF. That's why I'm thinking a scanner might be a good next place to start- might give you some clues.

 

I believe I found the problem. I was driving the car to work about 3 hrs ago when I noticed a change in the smoothness of the engine. I had my foot very steady on gas and could hear and feel in the pedal the engine pick up a cylinder,after I heard that I put my foot to the floor and she was alive. I stopped at the gas station let the car sit 5 minutes then left. I had the same problem no power. I believe I have a bad injector only sometimes.

 

I believe I found the problem. I was driving the car to work about 3 hrs ago when I noticed a change in the smoothness of the engine. I had my foot very steady on gas and could hear and feel in the pedal the engine pick up a cylinder,after I heard that I put my foot to the floor and she was alive. I stopped at the gas station let the car sit 5 minutes then left. I had the same problem no power. I believe I have a bad injector only sometimes.

 

I got the same plug you did and I thought the same thing about the wires except I dont know if he wired it the same way again or if he did it different. Although it could just be a bad injector but again I dont know maybe someone else could chime in and direct you onto the path from the fork which I directed you to if that makes any sense.

 

87iroc do you think you can look at your car and see how he wired up so I can try

 

I'll have to give it a look later because it will take some time to take off the 10 feet in electrical tape he put on.