98 obs 2.2 4eat w/ 125k miles
Mods - CAI with K&N cone air filter & DIY grounding kit
I too have a rough idle same as OP (vehicle comes to a stop..runs smooth when sitting in P and N)
Have - cleaned MAF, checked for vacuum leaks, cleaned PCV and adjusted idle (a while back haven't set back to oem yet)
Haven't changed plugs/wires or cleaned my iacv yet (need ngk platinum but recommendations on wires from autozone maybe?)
I pulled 2 IACV's from the local pick a part and they seem to move smooth after cleaning. will attempt installing one and cross fingers when i have time
noticed today i have a yeasty buildup in the PCV hose and other intake hoses and this worries me. installed my hoodvent cover plates in case it rains and was curious if seafoam would help to extract any additional moisture from my intake if there?