Took a chance and bought a 90 trooper destined for the scrap yard. On a trailer headed for the scrap yard as a matter of fact. Back story was the guy that owned it daily drove it, had the tranny rebuilt, fell into some money, parked it 10 years ago and never drove it again. I got it, changed the battery cables, dropped the fuel tank, changed the fuel pump, cleaned all the sludge out of the tank, and she lit right up. Since that I've changed the fuel filter, oil, flushed the brakes, clutch, spark plugs, cleaned the MAF sensor, and I'm sure I'm forgetting something. It has 22x,xxx miles and everything works except the radio. But I am having a few issues with it. It fires right up every time. Idles great, revs great. But after I drive it a while and warms up good, I'll press on he gas usually in 3rd or 4th gear and it will stumble/cut out whatever you want to call it. It never dies and comes back after I let off the gas and ease into it. I've searched and can't really find anything related to what issues I'm having. The rpms also surge a little when coming to a stop and pressing in the clutch. Anyway any insight or help would be greatly appreciated. I'm not really keen on throwing parts at something. I plan on changing the fuel filter, cap, and rotor soon. But I'm wondering if the issue I'm having is a sensor of some type. Anyway like I said any insight would be helpful.