I recently swapped the engine in my 1991 Chevy K1500 Scottsdale. It was a direct replacement with a remanufactured GM 305 TBI. The new motor runs, but with a few new problems that I think are linked to emissions, fuel pressure or timing. Looking for experienced opinions on what might solve the problems.
First, here are the items which I replaced during the engine swap:
Crate engine, Radiator, Clutch, Distributor+ cap, Coil Pack, EGR, TPS, MAP sensor, Vacuum hoses, temperature sender, fuel filter.
It also has a fairly new alternator.
The problems that I am experiencing include 1.) a lack of power 2.) stumbling/hesitation at ~2300rpm and 3.) occasional power surge when pedal is pressed, leading to a service engine code 43 (ESC malfunction/ knock sensor).
My timing is set at TDC. I have also tried to advance it 4 degrees. Still haven't done a fuel pressure check.
Does anybody have any thoughts on what this may be?
