I hope someone has an idea for me because I have tried everything I know.
my truck died and was towed home. i found no spark I replaced the ignition control module. the engine now starts, but runs like crap backfires through the intake and I have to depress the throttle about 1/2 inch for it to start. 7747 ecm stock 350 engine th400.no trouble codes, fuel pressure 13 psi/30 psi with return line pinched.
iac, tps, cts,i tried 2 known good ecms, all check out no vacuum leaks. dist set to 0 degrees. what has me stumped it acts like a timing issue and when I unplug the est bypass connector the engine dies every time. i manually advance the distributor about 20-30 degrees it runs a whole bunch better it still pops and sputters, but still dies when I unplug the connector. i have tried 3 different icm's there are no significant voltage drops that I can find.there were no signs/symptoms before it stopped running, it just stopped like I turned it off.
if anyone has an idea fire away