There is a learning curve to doing your own bodywork and paint(two different things). I did mine two summers ago and got great results. I can give some advice and post a link to my build thread where i have photos and details.
Let me try to answer some of your questions but keep in mind, i am...
My very first thought was a drippy injector since the stumble in the idle mimics a poorly adjusted carb. So i had mine flow tested and cleaned by Hurst Injector Service in Fitchburg MA for a very reasonable cost and quick turn around. Two injectors were underperforming and were restored to full...
Couple quick comments.
My truck uses the one wire O2 sensor and it’s only about 1 year old. It came with a box of spare parts. I don’t even remember why i swapped it with the one that was in there, other than it was new, but there was no change.
It’s been way too hot to get under the hood but...
I think my truck does behave like yours with respect to raising the idle to 2k or so and still exhibiting the “miss”. I am away from my truck until the weekend but can do more troubleshooting then.
I don’t think slightly low coolant or bubbles in coolant would cause any probs.
I’m now...
A couple more thoughts I plan to try as soon as i can.
1) put the timing light on each plug wire, look for inconsistent flashing while the miss occurs. Rule out ignition.
2) the AFM can be adjusted rich or lean by removing the cover and turning the cog 1-4 teeth in either direction. In the 90’s...
I am following your posts closely. Thanks for the excellent documentation on this subject. My truck has the warm idle miss also. Since it mimics a poorly adjusted carburetor i too thought an injector was leaking and had them rebuilt(not the cold start, though). It did not help. There is one...
And let’s keep in mind that was not a low-mileage, show room condition truck. It was a well-presented, high-mileage but very clean truck in original condition.
I think we have a new “holy grail” first gen, the 86 turbo.