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2000 LS Misfire Clue, maybe solution?
My 2000 V6 LS is having the misfire issue again. Already replaced leaky valve cover gaskets, coil packs and spark plugs. Car was running well, until now. Misfire at idle and under load (random misfire). Sometimes it sets the MIL, other times it does not.
Solution: the expensive solution is to use Techron fuel additive with every other gas tank fill up. The engine purrs like a kitten with NO misfire. However, this is too expensive and a temporary fix.
So does anyone have any insight into this? The coil packs cannot be bad again, or else Techron would not be effective. I am thinking that either water in the gas tank, or EGR issues? I think that by Techron increasing the octane in the fuel, it might be compensating for a stuck EGR maybe. I also doubt dirty fuel injectors since they would be faulty even with Techron use.
Any ideas please? Thanks!