I have a 1990 chev p/u with a 4.3 and 135,000 2 wh drive. The engine runs
good and has plenty of zip, but when on the highway doing about 60 mph, the
vehicle loses speed and becomes very doggy. When I let off the accelerator
just a bit, it will start to pick up. when I press down a bit more , it gets
boggy till it downshifts, then it goes good. Once in lock up, same thing......
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