GM 305 TBI Crate Engine Swap and Tune Up.

[dsky_90]

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?

 

[rugger55]

subscribed... I posted similar issue with acceleration stumbling at 2500 rpm