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Lately ever since winter began , Ive been having some loss of power going up slopes in my 89 blazer. I live in Calgary Alberta, and going west on stony trail from Deerfoot seems to be an issue.The moment i hit a slope my speed keeps dropping from 100 to 60. This used to happen during summer. During that time i used to downshift and that helped keep up the pace. When i downshift in winter i can hear the engine rev but there is still a delay in power getting to the rear wheels. At times i have to have the pedal to the ground to get some kind of speed. I have winter tires on .

Could someone give me some insight as to what could be the cause? What should i do to began testing.?

Vehicle spec Engine:4.3 L TBI V6 engine Transmission : 4 speed Automatic with Overdrive (4th gear is OD) Mileage: 180200 KM Parts Changed: distributor cap ,rotor and coil. new spark plugs

The previous owner stated that he did some work around the engine, didn't mention anything about rebuilding it.

Stony Trail is a highway in calgary , the section im talking about in the post has a lot of slopes. Deerfoot is just an another highway.

goodcat
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If your vehicle has a manual trasmission, its possible that your clutch is going out. If the revs are going up when you hit the gas but you don't feel the power getting to the tires, then its probably the clutch. Here is a video that shows you a few tricks on how to diagnose a bad clutch

https://www.youtube.com/watch?v=h7JJ_g2UuBI

Another trick not mentioned in the video is to downshift one gear while driving without hitting the gas, if downshifting does not make your rpms jump significantly then it means that the clutch is slipping and needs to be replaced

rviertel
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