I have a 98 Camaro that spits and sputters upon acceleration and also when the engine is bogging. Engine codes have been checked and it is still reading Lean Bank 1 & 2 and multiple misfire. It is automatic so when I pull it back down into drive from overdrive and let off of the fuel it seams to help a little. I have had this car in the shop and spent over a $1,000 on it this year trying to get the problems solved and it is still not fixed... I have put a FPR, Fuel Pump, O2 Sensors, Mass Air Flow Sensor, Plugs and Plug Wires. Does anyone have any idea where I can go from here?

 

Does this apply, maybe its just for manual cars but sounds like similar problem and its only a fuse you have to check:

https://camaroforums.com/forum/ls-series-tech-15/could-your-cars-problem-41780/

what is your car? v6, v8 ?? do you have anymods

have cats been checked?? are they blocked?? Have you checked the throttle position sensor?

have you changed fuel filter

 

I just checked the fuse and it was good. I was really hoping that would be it.

It is a V6 with no mods.

I put a new cat on just this past year. The only thing that I haven't put on is the Throttle Position Sensor.

Fuel Filter has been changed.

 

i dont know any of the common problems with the v6 myself, but im sure if you post in the 4th gen v6 section the guys will help you out, i dont wana keep saying relace this and that cause you have already spent enough cash on it

 

Misfire can cause the O2 sensors to see a lean mixture. The O2 sensors can only detect the amount of oxygen in the exhaust. A misfire causes a slug of unburnt fuel and unused oxygen in the exhaust. The O2 does not react to the unbuned fuel, but sees the extra oxygen as a lean condition. Conversely, a lean mixture can cause misfires. I would check out everything that cause a misfire including ignition, fuel system (chek pressure with a gauge), MAP, MAF, EGR stuck open, air leaks downstream of the throttle valve, clogged exhaust, temp sensors showing unreasonable temperatures, etc..
The PCM is pretty accurate detecting misfires, and does it my actually noticing minute changes in crankshaft rotational velocity, so if it reports misfires the engine is really misfiring.

 

I had the EXACT same thing happen to my 97 V6 i replaced the wires and plugs with no reults, finnaly i bought new coils after realizing two were split just about in half. also cleaned the tips where the ignition module goes into the coils VERY carefully and as sooon as i turned it on it ran like a top.

 

Do what z28pete said and like jeff2285 said, the coils are a good place to start. Also, might want to check to ensure that the new plug wires you put on did not get against any of the exhaust manifolds and melt. I ended up changing all 3 coil paks on ours, they were sparking but not nearly hot enough to keep from misfiring. If you have a spare plug and wire, you can check to see if you are getting a blue sparkie when it fires or if it is yellow, if it is yellow, then you might be looking at replacing. If you have access to a repair manual and ohm meter, it tells you how to take them off and test them for resistance. Also, listen under the hood for vac leaks.

 

if you have access to an oxy/acetalene torch you can find vaccum leaks on the manifold pretty easy
just turn on the oxygen and run it aroud the manifold slowly is you hear the engine rev up the leak is there
i also had a vacuum leak problem on the front throttle body where that dumb rubber thing meets i just zap stapped that alot tighter