2002 with 170k miles. Cold start, works perfectly, and drives as normal. When I park for example to get gas, it starts back up. If I park it for longer, say to go into a store for 10+min, it won’t start. It bogs and sputters, then dies. Kind of like it’s running too rich…? Each successive start attempt is worse, then it barely turns over.

After that, I wait about 45min, then it starts back up like normal, and runs perfectly.

MPG is the same as ever (-shitty).

Tail pipe is clean, not black. No smoke or anything.

When this first started, it was occasional. But months later it’s every time.

It threw a p0171 code, but only once.

I’ve cleaned the MAF multiple times, throttle body, air filter.

Suspect peoples first guess is a vacuum leak, but this doesn’t make sense to me, because there’s some kind of temp variable, it runs fine except for the warm start.

Ideas?

Thanks.