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Message: <blockquote data-quote="1BadSVT" data-source="post: 1561324" data-attributes="member: 31573">Haven't posted in a while, but long story short I have a theory. I posted a while back the previous owner ran the car for a while with crank case vent going straight into air filter which led to oil accumulation under intake. Evidence showed majority of oil from crankcase was being sucked into 4 and 8. The fuel injector for #4 appears to have been working on and off with varying levels of combustion, based on plug inspections. I believe the oil clogged the injector(s) over time which has lead to random misfires and vacuum. (Not 100% on the vacuum part) I had put in a new plug at #4 and verified spark, but that plug looks brand new after idling for about 30 minutes total over the last few days. I doubt it's water steam cleaning from a leak because the piston looks unchanged.A cooling system leak down test was already performed but I'm planning to do a quick compression and leak down test before pulling out the injectors. Also, a new fuel filter and passenger side exhaust gasket were installed. There was no gasket in there and I was able to remove all of the rtv. YuckThe whole goal of this car has been to enjoy repairing and working on it, hopefully drive it for a year, then drop the engine winter of 2025. Let's see if she makes it.</blockquote>