[monkeyodeath]

I'm at wit's end with an issue I've been dealing with on my '86 3.2 for over a year.

Basically, when the engine is warm, I'm having a major stumble issue and occasional hard start.

The stumbling manifests itself at times of low RPM and high load -- like, for example, shifting into 2nd after taking off from a stop in 1st. The car really stumbles badly as I try to pull away in 2nd.

I've replaced the intake manifold gaskets, swapped to a known good AFM, had the DME looked over, tried different ignition coils, swapped the FPR, replaced the fuel pump, and had the injectors cleaned.

In some ways, the situation has improved -- for a while, the car wouldn't even start or idle and now it does that fine, but the hesitation at low revs/high load remains, and there's a very occasional hard start issue. Passed smog last week with pretty fantastic numbers for whatever that's worth -- so at least the engine is generally running OK.

I'm wondering, at this point -- does it make sense to use a wideband O2 sensor to help diagnose this problem? To at least see what the mixture is doing when the car stumbles? Kind of feeling like I'm running out of stuff to replace here and any help/advice would be super-appreciated!