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Old 08-19-2022, 04:58 PM   #27
bp05obxt
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Member#: 459799
Join Date: Dec 2016
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This is an interesting one..

Is the car running a cobb flex fuel kit? I assume it is with the description but it technically only says flex sensor so I wasn’t sure. If so has there been any attempt to remove the flex kit and try returning to pump gas on just the factory harness? Cobb flex kits have been known to fail or have odd issues.(the factory harness could have issues too; anything is possible)

A random thought I also have considering you did a smoke test did you check the brake booster independently. I’d struggle to see it causing this much trouble but potential it has failed internally and only causes running issues due to pulling air into the system. You are on SD so again I don’t see that being likely but a smoke test or boost leak test wouldn’t show anything with the check valve in place on the booster vacuum line.

I have seen ethanol mess up injectors even if they are rated for Ethanol. One thing you could check is on the top of the injectors there may be SS filters/screens that may have corroded causing the injectors to not work as they should. This will cause the car to run sporadically.

A couple thoughts..
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