Intermitent car shaking / terrible performance

1997 CHEVROLET LUMINA
165,000 MILES
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JASON VR
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Once in a while, say 2 times out of 9 driving the car short distances the car loses massive power and starts to shake. You have to hold down the gas petal to get the car to accelerate, and even then max speed would be maybe 50 - 55 mph, although it does shift gears fine. Then the car will surge will power and drive like a top randomly. Then sometimes go back to the shaking.
Also, when the car is running optimally and i am idleing down a hill or on a stright part on the road going about 55 or so, the car will slow for a second ..almost like the break got tappped, then go fine then slow a second again....


im tottaly stumped, thanks

jason
Apr 12, 2013 at 12:27 PM
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ASEMASTER6371
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i would start with a fuel pressure test it may be low causing your issues

Roy
Apr 12, 2013 at 3:16 PM