My 1998 s10 4.3L 2wd has 78000mi and is having issues. Lets start from the beginning....since april I have: -replaced serpentine belt, belt tensioner, and fan clutch -replaced intake manifold gaskets, fuel pressure regulator, thermostat, cap and rotor (intake leaking antifreeze, other items replaced while engine apart) -replace water pump, radiator, and oil cooler line (all leaking) -replaced fuel pump and fuel filter -replaced plugs and wires. I am at witts end with this truck. I would love to push it off a cliff, but i cant afford to replace it. Now to the problem: I have what I would call a "miss" or "stutter". This problem usually occurs at speeds above 40mph. and at constant speed, but has occured accelerating from a stop a few times. Sometimes it does it, sometimes it doesn't. If i have the truck in "3" instead of Overdrive, it gets worse. I have only had it throw a code once, and that was the "random multiple misfire" code. I found the fuel pump was low on pressure after this problem started and replaced it. I replaced to plugs because they were originals, and figured it couldn't hurt. Does anybody have any suggestions? This "miss" started several months after doing the intake, so i really dont think that has anything to do with it and spraying 2+2 around the intake doesn't make the engine change speeds. There's so many sensors and electronics on these engines i'm at a loss on where to start.