so my engine has a serious misfire only at idle up to about 3000rpm then runs good
We've gone trough all the basics distributor, wires, plugs, cleaned maf, checked map and maf sensors.
During fuel injector test your supposed to turn engine to on position get around 55lbs of fuel pressure and then it should drop when you start motor about 4-8psi. Mine dropped 2psi.
Than when you shut the motor off it should keep fuel pressure for about 1 minute than bleed off, It should be bled out completely after 5 mins.
Mine is not dropping fuel pressure even after an hour of being shut off. Its still showing 58lbs of fuel psi.
Im also noticing a huge difference in numbers between my ST and LT1 and 2 banks numbers are way off from each other.
My question is could the fuel pressure regulator be stuck and only starting to function once enough vacuum is formed inside the manifold forcing it to start working.