Long story short, 87 Iroc. Ran great for 6 years with crate 350. Now code 33. Runs fine for 2 miles then check engine and runs bad. Replaced 3 relays, relay plugs, MAF and MAF plug, TPS and coolant temp sensor. Still only runs for 2 or 3 miles then check engine and Help? Broken wire? ECM? Anyone in vegas work on these? Thanx!

 

Parts cannon claims another victim. I'd recommend getting a datalog to see what the ecm is seeing, and following the diagnostic flowchart in the factory service manual.