ok. As I write this I am searching the Innerweb for answers: I am travelling across the country, truck is dead right now. Here is detailed report, live from the Flying J at exit 15-B, in Gary Indiana. anyone in the area, feel free to come on up and help me, I am not looking forward to the potential bills. ok. Truck is a 1987 454, TBI crew cab dually. Has been running great, smooth, no trouble, no problems at all. Has 148k on it. About 400mi ago, I got some gas at a BP. Truck had an exhaust leak since I got it, it got a lot louder around the same time as the BP fillup. Filled both tanks. Drive away, truck starts to kind of hesitate just the tiniest little bit under hard acceleration, but pulls away with authority. All is well. Later on.... starts kind of... not really responding on uphill pedal mashes. Just kind of motors along. Hmmmm bad gas! I think. New gas in one tank. Same symptoms. Oil pressure, temp, tranny fluid, coolant all check out ok. Mild curiousity, what is going on? but not worried yet. Truck is kind of loud and I can feel a little roughness in the gas pedal. Still cruising at 75mph but seems to be working a little to do it. Roll up the to 80/94 toll area, slow to a crawl and.... truck is stumbling badly in N, running rough and surging in D. Very dramatic difference. Very concerned about getting stuck here. Pay toll, accelerate briskly, smoothly, but sounds odd now that I'm listening. 20mi to go. Truck will not go faster than 58mph, and thunks/knocks and acts governed somehow if pedal is pressed. Now very concerned. Doubting bad gas theory. Roll into the Flying J, truck dies, rolls into spot it currently sits. No-tool diagnosis, 25hr driving binge and no food(all my tools are in the van I'm trying to get to in this truck. ) Fuel filter is fine. Or appears to be anyway, no discernible obstructions. Fuel, air, spark seem to be present due to the fact that the truck will start but runs REALLY rough. Calls are made. Nylon timing gears? that would suck. I suspect loose distributor but no, it's solid. Cracked rotor? Hmmm would be strange, but I can't check it until morning. So. Any theories???? ???? I am really hoping it's something small. Timing seems to be off but I am not thinking real clearly right now, very tired. thanks everyone. This is not a good thing to have happen right now.