Question about 2000 Buick LeSabre

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My 2000 buick le sabre jerks and loses power while accelerating.

I took it to the mechanic and he said he could find nothing wrong with the car. However, this morning as I was driving to work it started jerking violently (not vibrating, but jerking like when a stick shift stalls) and losing power. I floored the accelerator but it would no go above 20 to 30 miles per hours. I'd be grateful if anyone has ideas as what might be causing this.

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First scan for any codes if it comes up po 300 just a guess it could be random misfire puts the car in limp mode . the igniton modual underneath the coil pacs the coils sit on could be redy to go or if not that check fule pressure by puting fule pressure guage on shrader valve located on fuel rail on top of injector assembly and check fule pressure with fule pressure guage. car of key on pump reading should be around 48-55 key on car on reading should be around 55.minus -3 to 10psi = reading of 38 to45 only if the fule regulator has vacume line atached to it on fule rail dubble check psi reqirments in car manual for co mpleat accuracy. If it doeint have vacume line pressure stays constant 48- 55psi

Posted on Apr 28, 2010

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