I have an 86 z28 camaro with an electronic quadrajet iv already replaced the fuel filter and fuel pump as well as ive dropped the tank and replaced the pickup strainer. All the fuel lines seem fine theres no leakes. ive already tried checking for vacuum leaks at the carb and it doesn't try to rev up when spraying starter fluid around the carb body. Compression test put all 8 cylinders between 119 - 122 psi. Im not sure whats wrong with it maybe the mcs or tps is bad maybe the computer??? Maybe the accelerator pump??? Bad float position???

All i know is in neutral it revs up fine it sounds awesome but as soon as I try to drive it it seams gutless and then starts to buck and bog but at times it like picks itself up and starts to take off like a rocket. But it's mostly not drivable. Like if anyone has any idea what it might be id really appreciate any info before I just start pulling apart the carb.

 

I don't know Rochesters, but back in the day I remember the power valve always had carbon buildup.I switched to Holley, and don't look back.
Put a kit in it!

 

Sounds ignition related to me. Need to make sure the weights aren't frozen up or sticking under the rotor in the distributor.

 

Check the ignition module under the cap

 

Ok so i tried testing the tps and its jumping all over the place sometimes it stays around .389 other times its all the way up at 1.340 i tried to adjust it but it didn't matter how much i turned the adjustment it never really changed it unless it wanted too. So i found a company that sells rebuilt carbs for about 280 do you think maybe i should just replace the whole thing cuz the cheapest im finding the tps and mcs is about 100 and about another 40-60 for just the standard rebuild kit. Basically i figure if im already gonna spend 140 i might as well spend 280 and have a carb that rebuilt by a more experienced professional.

 

Did you replace fuel filter and still have the same problem or did it go away for awhile?

 

I had the same issue a couple weeks ago, with the addition of hard starts. Changed plugs and wire and it was better for two days, until the ignition coil went out. Replaced coil, rotor and cap and it did the trick. I originally thought it was fuel related too.

 

Yes i did replace the fuel filter but no it didn't help.

 

Ok so today I decided to take the carb apart and I found several issues with it its slightly hilarious idk who put it together before i got it but they weren't to bright. So the driver side idle screw was completely bottomed out and the passenger side was out 6 1/2 turns lol. Also the float was set way wrong it was probably only filling the bowl about a 3rd of the way. On top of that the tps sensor didn't even have the plunger to depress it so i got a new tps and it thankfully came with one. Now the icing on the stupid cake is the secondary metering rods were put on backwards if that makes sense basically they wouldn't even sit in the proper position also the hanger was bent way up in order to get it to screw on in this wrong position if that also makes sense. So thankfully now my z28 is doin nice smoking burnouts and moving like a car should.

 

Isn't it great when some people work on stuff. Glad you got it going.