Recently swapped my engine from a stock 305 TPI to a brand new GM 350 TPI, but I am having running issues my check engine light codes read 33,34 and 42. Car seems to wanna die when engine has been running for a while and I'm not accelerating. I'm thinking some of my running issues may be coming from the injectors because I reused the ones that came with the 305, what do you guys think?

 

I take it from the 33 and 34 (MAP) codes you are running a 7730 ECM (SD)? You should provide info on your setup so others will be more informed and more able to help. With that being said, check your 5 volt reference at the MAP sensor. All vacuum lines hooked up and in the correct locations? Using the original 19 lb/hr injectors and not compensating for them in the tune, you will be running extremely lean. Probably some of your problem but not all. HTH!

 

I am still running the original for the 305, could this be the issue? I've checked all vacuum lines from top to bottom everything is in good shape. This is what i know about my engine Crate GM 350 4 bolt main 8.5:1 compression. Cam is .383/.401 dur 194/202 112 lobe Sep. Valves are 1.94in/1.5ex. 76cc combustion cambe on cast iron heads. All sensors and ECM are from the 305