I have an 89 trans am that had a 350 stock in it. someone before I had the car took everything out and now i'm stuck trying to piece everything back together. So far I have everything and the car runs...kinda. the car idles fine but anything past idle the car starts backfiring and seriously won't even rev up. intake and exhaust backfiring. when I disconnect the bypass wire to time it the car actually retards when I give it the gas(this is all of course after I've timed the thing to 6 Before), and when i plug it back in it advances and still won't run. both directions makes the car backfire and I'm just at a complete loss with it. I've checked pretty much every sensor and everything to my knowledge is just fine. I don't have all the vacuum lines hooked up yet but I'm sure they won't make it do this, plus i don't have any emissions hooked up due to headers. PLEASE HELP!!!

 

are you sure the distributer is synced up
disconnect the coil bump the car till TDC
pull the cap where is the rotor pointing??? Should be pointing just slightly before cylinder 1
any service codes ????

 

well it wouldnt hurt anything at this point... i'm pretty sure its just fine though because it runs pretty good on idle but anything past that is horrible and doesnt really work. could the ecm be toast i wonder....