Posted by SDE on July 14, 2012 at 07:08:15 from (174.124.8.153):
Hello, I bought a truck and trailer to haul my tractors. Unfortunately, this truck will lose power when driving on the highway, but it never stalls. It might start to lose power at 40 mph and without moving the acclerator pedal, it will drop down to 30 before the engine kicks back in and goes back to 40mph and then it will do it again and again. I put the pedal to the floor once and when it kicked back in, I got it up to 90. Once when it lost power I pushed the clutch pedal in and the engine went down to a about 500 RPMs and then jumped up to 1500 before going back down. When I stopped moving it idled at a steady 750. Any idea on what I need to look at to fix this? I put some injector cleaner in it and sprayed the throttle body and changed the air filter so far. It does not do any of this until it is warmed up. Could it be a sensor? Thank you Steve
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