89 4.0 auto, I've done cruiser's tips a while ago. Last trip I went out on the way back I got a bad miss fire, ended up being a bad vacuum leak, Sat for a while, then I was able to fix the vacuum leak. but sat again for a while while I didn't have money to run it. Drove it last night and got a sudden missfire, but it went away after a few moments, maybe 10 Seconds or less. Then a few miles later came back, then when away for a while, Drove it again today, It still had the miss fire every few miles for a few seconds, but not as bad as last night, I don't see any obvious vacuum leaks and my spark plug wires are all plugged in right. Anybody have any ideas? I don't even know where to begin on this one.

 

nothing?