My truck I just bought sat for 10 years got it for good price but it ran bad, would sputter, spit back fire and when it ran cold it would do @60mph. Then it warmed up it did @20mph or less. Everytime I would replace some thing it would run great and then it would act up again. Truck has over 100,000 miles on it. Reading many threads through the search on this site and it helped a lot. Here are some of the problems I had-
Top 10 list why my truck ran bad:
1.Bad Carb Replaced it with a Weber 38 DGES
2.Bad front brake calipers sticking-Replaced
3.Bad Fuel pump, worked but not enough pressure when driving. Replaced with a Mr Gasket blue pump rated 4-6lbs.
4.Too much fuel pressure. A regulator was in order, but a fuel pump cost just as much so I went with new Mr Gasket red pump instead. It was rated 2-3lbs which is required for a Weber per their instruction sheet.
5.Bad ballast resistor- Used an MSD 6AL to eliminate the ballast resistor
6.Bad points-burnt- Used MSD 6Al, it runs low voltage to the points so even if points are bad, as long as they make a signal to the MSD they work just fine. Eventually replace points, had a set of points in another truck that had a short in them, so I put new points in this truck and used points in that one that I don't drive often.
7.No mech advance in dist.-Took dist apart, Previous owner put SBC springs in mech adv. Springs to strong, adv didn't kick in till really high rpms. Replaced them with Mr. Gasket curve kit springs using med to lite springs.
8.No vacuum adv-Took the vacuum adv plate off. I was froze up with rust so I cleaned it with carb and brake cleaner, wd-40 and then pack the bearings with grease just like I would pack front wheel bearings.
8.Coil wire bad and a dead spark plug wire. Due to the MSD it ran on all cylinders but it had a miss and a back fire in the exhaust on deceleration, and vacuum showed poor vacuum. Was told the truck had new spark plug wires and cap and rotor. Friend of mine checked the wire and the wires had a lot of resistance and one was non existent, dead. The coil wire had so much resistance it was close to being dead. Replaced wires.
Truck started running 90mph. But ran bad at lower speed until the spark plug wires were changed.
9.Compression test showed all cylinders in good shape, check timing according to spec's. Timing good. Adv.good.
10.Blew a tire at @85mph after visiting Figueras and buying some parts. Luckly got some rims with tires and used one of them to get back on the road. Replaced tires with new BFG'S
Truck runs great and gets great mileage. Need to rejet, runs a little rich. Will do that next.
