2002 Pontiac Grand Prix Hesitates and looses power between

2002 PONTIAC GRAND PRIX
105,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MDIETZ
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  • 3 POSTS
I had a recent problem with my 2002 Pontiac Grand Prix 3.1 litre, when on the freeway, and I commute, it would cut out between 60-65 mph, but when i go over that, it runs ok. But consistantly between those miles per hour it cuts out and i can see the rpm's go up. I changed the plugs, air filter, spark plug wires, along with flushed the coolent system. Well, a day later drove it to work and it seems like it not only didn't work but it's getting worse than it was. What else can i do?
May 19, 2008 at 4:28 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Do you have a check engine light?

For a start try checking the throttle position sensor/ MAP and MAF sensor-also the fuel pressure. The computer uses these sensors input signals for fuel and timing adjustments-
May 19, 2008 at 4:56 AM
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MDIETZ
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[quote:12cb2e120e="rasmataz"]Do you have a check engine light?

For a start try checking the throttle position sensor/ MAP and MAF sensor-also the fuel pressure. The computer uses these sensors input signals for fuel and timing adjustments-[/quote:12cb2e120e]


No check engine light comes on. It idols still a little bit rough but accelerates good, but cuts out only between 60-65. I will have those items you suggested checked. I should probably change the fule filter as well yes?
May 19, 2008 at 5:28 AM
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