have a cc q-jet 305 .starts fine. sometimes idles o.k. but most of the time it jumps to 1500 or more and won't come down until taken out of park. then it causes back tires to spin when it jumps down to 500 rpm. puts out code 13, 34, and 44. i've replaced o2, fuel pump, tps sensor, and plugs and wires. when i tried to drive it today it hit 10- 15 mph and started to sputter, hesitate, and jerk like it wasn't getting gas or something. it would go any faster. i don't have much money to put into this. i've looked for vacuum leaks but no luck other than maybe carb. any advice? i have an 84 that just blew it's gasket. i'm tired of spending all my free time on this. it's fun but enough is enough. i know my husband is tired of me putting money into this.PLEEEASE HELP!

 

swapped carbs. and car quit high idle. running fine in park. went down the road and started hesitating and wouldn't go again. only code was 44. catalytic converter went out. has hole in it now. took it off still didn't fix problem. any clues why car won't go??????

 

if they cat whent out you might wanna make sure no pieces of it whent back and lodged in your muffler. just unbolt the ypipe from the cat and hang it with some wire see if it works running open.

 

thanks, i tried but the car still does it when i going under 35 mph or up a hill. it dies when i make sturns also.i also noticed it doesn't have any pressure when the gas cap is taken off. i'm thinking something with fuel now. i've replaced pump but didn't fix it.

 

have you replaced the fuel filter ?

 

like stated before check the fuel filter,
more ideas
also if you drive it hard you should take off the valve covers and check to see if everything is OK not bent, stock push rods bend easy
is the new tps sensor set right?
did you clear out the codes before restarting?
is the fuel pump working properly?
dose the return fuel line work?

later and

GB

 

Code 44 is O2 lean. That doesn't mean that the O2 is not sensing fuel, it's sensing extra O2. If you have some cylinders not firing then the unburnt fuel AND O2 is passing into the exhaust stream. Running lean can cause this mis-fire as can ignition.

Car runs fine above 3500 rpm? This could point to the primary circuits controlled by the ecm.
If you don't have a dwell meter try unplugging the TPS at the carb. This will cause the carb to run full rich all the time. See if it makes a difference.

Ignition is still a possibility as mis-fire is more noticeable at lower rpms (and will cause the same trouble code). You replaced plugs and wires, how about cap/rotor. Got an 84 donor that you pulled the carb off? Maybe swap some ignition stuff over?

 

fuel filter has been replaced. i haven't tried to see if new pump is working. i'm kinda of new at learing everything about this car. i can rev it in park and it sounds great. no new cap or rotor yet. my husband wants to save as much as possible since we've spent so much on it. i didn't think about taking valve cover off. i will try the tps off and see how it does. i took one of the new plugs out the other day and it looks like it was covered in soot. i just cleaned carb and it is also black all on the top of it now. when it is warmed up and shuts oof it spits gas up. any clues? i'll check these

 

Your black plugs indicate that you're running rich. Mis-fire can contribute to this as the ecm compensates for the extra O2 by richening the mixture. Vaccuum leaks could also be a culprit.

The best way to check for leaks (IMO) is to plug every port on the carb and manifold then reconnect each line one at a time to see if there's a diff. You could also clamp on each hose with a pair of pliers near the port while it's running to see if there's a change, not as accurate but quicker and easier.

Pull your cap an rotor off and inspect them. Look for the obvious, cracks burns scratches or other evidence that the rotor is hitting the cap. Run it at night, in the dark and look for sparks/arcs around the distributor and all wires. Re-check your wires and make sure each is connected to the right plug. It happens.

 

thanks, hopefully it will stop raining and i can go check. the 84 is my car that will be a conversion but it blew a gasket so that's why i took it's carb off and swaped. i'm going to have to go back and forth on working on these cars. i'd like to get my 84 running soon. i have a 99 also but there's just something fun about driving the old one.i've gotten a lot of good advice. thanks for everyones help. hopefully i can find the problem soon so i can sell this car.