I have a 91 camaro it has a 73' 350 4 bolt main block with H.O 305 heads and the rest of the engine from a 91 camaro.....The problems im having are when you crank the car from a cold start it idles up and down and almost dies but mostly idles very low, also when i accelerate it is kind of jumpy and it sounds like it backfires a little, also if im driving and quickly give it gas the car sounds like it cuts out then backfires and goes, also it will occasionally start running poorly and it is almost as if the car bogs down and revs kind of slow and is barely able to gain any speed when you are in drive and accelerate ....but when park or nuetral the car will rev fine....i need some suggestions of what it might be? if its a sensor or what? ...also after driving for a while the SES light will come on Please help thanks

 

if you've got an SES light on, you need to check it out. that will be your first step in solving the problem. but check for vacuum leaks, make sure the jets are firing correctly (timing light will help you see the pattern), and make sure the plugs aren't fouled at all