my dad and i advanced the timing on my 84 z28 and now whenever i put it in drive or reverse it stalls. im not sure how much he advanced it because he did it by sound then checked it with the timing gun. i think he advanced it 16* from factory specs. the car has a all stock 305.

 

stock should be at 6 deg. BTDC. the timing should be set with the EST (electronic spark control) circuit disconnected.

 

we advanced it because the car didnt have enough get up and go to even pass someone on the highway

 

sounds like a bad pick up coil or ICM to me. i had the same issue.

 

i just got done giving it a full tune up (plugs, wires, cap, rotor etc.) and the car runs great and has alot more pep now that we advanced the timing. the only problem is when i put it in drive or reverse i need to immediately give the car gas of it stalls.

 

thats what i mean. the pick up coil and ICM have a tendency to go bad and you dont replace those for a tune up. those may cause the drivability issues your describing.

 

how much would it be to replace those by chance?

 

okay you advanced the timing.are you running higher octane now?also what does it idle at in park?