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So I convinced myself that I needed to replace my intake gaskets, as it seemed like a common issue on 3.2 engines that caused similar problems to what I'm experiencing.
Took the opportunity to take care of a bunch of deferred maintenance. Resealed the Triangle area, replaced vacuum hoses, rebuilt the fuel lines with new hose, and had the injectors cleaned.
I kind of regret replacing the intake gaskets, it was a huge PITA job and none of them had been sucked into the intake, so I don't think that was my problem.
Naturally, the stumbling issue persists. On a cold start, the engine fires up fine, but with an idle that stumbles and occasionally dies.
The car also seems to have trouble in low gears and low revs when it's cold. Main time I notice it hesitating is when I have just shifted into 2nd and I'm trying to pull away, or while in 1st. Big stumble and momentary shudder.
Car runs fine at >3000 RPM.
Once the car is warm the engine has a stable idle, and hesitates much less frequently when pulling away in 2nd, though it still happens sometimes. Previously I was noticing a very slight, occasional stumble when cruising in 5th, but not recently.
Happy that the car runs and drives, but would still really like to figure out this problem. Fuel pump? AFM? DME?
Wondering if I'm at the point where I should put a WBO on this thing and get some numbers on how it's running at idle.
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