'91 T-15 Jimmy, 4.3L/700R4, 4x4.
Lil Jimmy has aquired another nasty problem. On the freeway (100+ kph) and once around town (60-70 kph) the truck has kinda bucked a little bit, kinda feeling like the torque converter unlocking and locking a few times per second for a good two to three seconds at a time. It has been pretty intermittent, although it has usually occured on the skyway (a fairly steep bridge). It got to the point last Wednesday that just as I came off the skyway it did the little stumble and as I was moving over to get off the freeway as soon as possible the CES light flashed for half a second and the engine quit. The engine cranked for a few seconds before restarting (usually restarts on the first crank when shut off normally), got me maybe twenty feet, and quit again. Restart again after another cranking session and it quit again at the bottom of the offramp. Again, cranked it back up and it made it to work with no more problems. Once there I checked for codes and found nothing.
Since I had one waiting to be installed I changed the fuel filter before heading home that night. The old one had a lot of crap in the inlet side so it was pretty clogged (as far as I'm told, the older guy helping me had pitched it before I crawled out), and Jimmy ran quite a bit better on the sidestreets, but I swear I felt it stumble for half a second once on the way home. Any ideas? How the hell am I supposed to diagnose this? I figure I should check the fuel pressure for a possibly dying pump (once I find a gauge for my TBI setup, damn useless parts stores) and maybe throw a cap and rotor at it (it does tend to go through them every once in a while), but other than that I'm left scratching my head.
I'm awfully close to just scrapping the damn thing...