runs rough for few minutes after restarting when hot
On my '92 SSE */c, if the engine is warm and I shut off the engine to stop at a store for a few minutes, for example, the engine runs a bit rough for several minutes after I restart it. When it'* running rough, the idle rpms are stable and appear normal, but the boost gage jumps around a little bit more than normal (maybe 3/16" or so as opposed to 1/8" or so normally). After driving for a few minutes, the problem goes away and the boost gage fluctuations return to normal.
There are no error codes, and no other known symptoms.
I haven't used a scan tool to look at the measurements while the problem is occurring, but even if I did, I suspect that I wouldn't see any odd readings.
I doubt that the problem is heat related because it only happens after restarting when the engine is hot; it doesn't happen after starting the engine (cold) and driving while the engine is hot.
I'm wondering if maybe it'* the IAC sensor?
Have any of you encountered this before?
'99 Bonneville SLE, white, 112,000 miles
'02 Park Avenue Ultra, white diamond pearl, 88,000 miles