Thank you boozehero for the update & answered questions; you deserve a good rest... Perhaps your truck was carrying a heavy load over them mountains, slowing it down..? Or slow down was caused by the changed transmission to the five speed (does a stock 5 speed truck have the same rear gear ratio as yours?) BIG exhaust can make BIG changes to an otherwise mostly stock engine; sometimes, the change is very negative because a smaller diameter tube has more scavenging affect... Much brake work was accomplished on your truck (right?) check em again for dragging..? Like geezer said, the air/fuel adjust & pitch perfect timing (initial timing, vacuum & centrifugal) need to be correct + good compression 'n valve timing... Assuming your truck is not having any miss condition; it's just low on power..? Maybe refer to the "Low on Power" FSM troubleshooting chart..? Heck, I dunno... Have you ever turned the engine over with just your hands on the fan belts..? I did when all four spark plugs were removed and we were installing a new front crankshaft seal ~ it spun fairly easy... Did you change wheel or tire sizes..?Originally Posted by xboxrox
Well, enjoy the fix as much as possible & maybe we can learn something from your efforts...
Most Respectfully,
George
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