1998 Lexus GS 300 car problems

1998 LEXUS GS 300
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CHARRON
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  • 2 POSTS
1998 Lexus GS 300 Automatic 2000 miles

hello my lexus is shaking real bad when it sits for hours then i go to crank it it shakes or about ten min like a rollercoaster then when time to drive it it s=cuts o and then i i go 50to 60 miles and hour it makes a knocking ound like thump thump real loud and the speed drops and i have to put my feet all the way down to the gas pedal to pick up speed. i have been told and bought so many things and it is still doing the same thing fuel ilter was put on, sparkplugs, throttle position sensor now i was tod the cadallac converter and the timing is off. i really dont know please can u answer this question so people can stop guessing thank u
Mar 19, 2010 at 7:35 AM
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DAVE H
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have the catalytic convertor checked for blockages
Mar 21, 2010 at 8:34 AM
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CHARRON
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I had the catalytic converter check and it was block but iam still having that shaking on the car when i crank up throughout the day some people say it might be a motor mount i really dont know this time what could it be please help again. thank u
Apr 3, 2010 at 1:00 AM
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DAVE H
  • CAR REPAIR CONTRIBUTOR
  • 13,384 POSTS
have the motor/transmission mounts checked/replaced
Apr 4, 2010 at 5:11 AM