I have a 1989 GMC sierra 1500 with a thrittle body 350. I recently changed out all the gaskets in the motor and now I can't seem to get it to start. I have tried just about everything. It is in time from what I can see and I even changed out the Idle air control valve and still nothing. I feel like I'm at a dead end here, can someone please help me out here?

Thanks, Eric

 

Which gaskets did you change? Did you unplug the computer/advance wire when you set the timing?