I’ve got a 1990 v10 5.7 Blazer that we have recently done an engine
swap in. We had about 150 miles on it, now it wont start if its warm.
The engine will only start when it’s cold, and then it will get to
temp and run rough for a few seconds and die. Tonite we tried to reset
the ECM by unplugging it, we got it up to running temperature when it
started to sputter, so we would rev it/maintain a high RPM. It would
keep running but it was running extremely rough and the exhaust
smelled rich with gas. When we let off the gas it died. Strangely
enough from the Catalytic Converter back was bright red. We never
noticed it during the day, but now we are completely stumped. We
figure it has to be some kind of computer, we have replaced the
distributer, ignition control module, the coil, the O2 sensor, and the
throttle body was rebuilt.
Something makes us think its the Air/fuel Ratio that is flooding it
once it warms up.
Any advice would be great.
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