Sometimes DIY repair ends in expensive gremlin chasing frustration, good luck OP.
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Cake day: May 18th, 2026
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Blegh I wasn’t gonna share this earlier since it still stings but:
I just went through it with my 1994 K1500 truck. Head gasket leak fouled every single damn one of the sensors the oddball and short lived Throttle Body Injection system ECU relies on. All of them, I soon discovered. First it was only rough running when cold, then became undriveable. Plus it leaked coolant out the rear before it worsened and got into the oil, so it evaporated into the distributor and MAP sensor for months probably and corroded them into a nice bright green copper oxide.
One part at a time scouring old forums and watching pixelated old YouTube repair guide videos for advice on why it was running rough after getting the gasket done, especially cold. Eventually got it…$1900 later. Even did the fuel pump. This particular truck model year is worthless even operational so I was definitely weighing my options before that last magical part swap lol.
Didn’t take many pics but here’s one of the distributor: