2days after I changed the oil on my 96z it developed a stumble/miss at 1500-2000rpm. After that it goes away and seems fine. I've ruled out o2 sensors they are 500miles old. The plugs and wires have 3k on them and 8months old. The car has 65k on it and I can't figure out what it can be. Also it has gotten a little worse idling is getting harder 2 do and the miss/stumble is feeling worse. HHHHEEEELLLLPPP. I don't know what it can be at all.

 

You mentioned the plug wires were recently replaced...might want to take a close look at them to make sure one or more aren't close enough to the exhaust to have gotten fried.

 

Wire clearences are fine nothing touching anything