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BULLSxxT!!!Convert to a carburetor. TBI suck.
Do you have a scan tool that is capable of monitoring a pid called “cam offset”. If so, you must rev the engine up to over 1000 rpms, like 1100 or so, while watching cam offset degrees. Loosen the distributor hold down bolt and rotate distributor until cam offset reads 0 degrees. Plus or minus 2 degrees. This will ensure the timing is on point with the crank position. Also called crank / cam correlation.I am at an absolute loss with my truck, maybe somebody here has an idea....
It has a new GM Goodwrench Performance crate engine (JEG'S part number 809-12681430), was installed summer 2018, and has less than 3k miles. Transmission was rebuilt earlier this year, less than 300 miles, and a JET Performance ECU was installed. I have flipped ECU,s, with no different outcome. I have had nothing but trouble with it lately, it idles fine, but as soon as it has a load, it sputters and backfires. I have tried 2 different distributors, replaced TPS and all temp sensors, runs fine on idle, and at all rpm's, when no load, but cant handle a load. If I floor it, it runs right up on rpm, and runs fine, but regular driving is no good. Anybody have any idea?