2002 Chevy Impala Engine Stutters - Transmission Downshift

Tiny
SHANNONBRU
  • MEMBER
  • 2002 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 262,351 MILES
My 2002 Chevy Impala is not doing so well as of late. It is a high mileage vehicle (262,000+ Miles), but I am fanatic about maintenance. The engine has recently started stuttering at 35 mph, 45mph, and this morning, even 65mph. It seems to shake like it is trying to down shift, but cannot quite do it. When I step into the gas, the transmission downshift, and the car gets up and goes. But if I am on cruise control at 65 mph, and start going up an incline, the car will shimmer, the tach shows the RPM's jumping between 1500 and 2000, and I can get it to stop by stepping on the gas. I've had catalytic converter replaced (a few times now). Not sure if my issue is engine or transmission related. Any thoughts?
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Tuesday, April 27th, 2010 AT 6:17 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
This sounds more engine releated than transmission. Have you checked the fuel pump pressure? Has the check engine light come on? When was the fuel filter replaced last?
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Saturday, May 1st, 2010 AT 1:35 PM
Tiny
SHANNONBRU
  • MEMBER
Sorry for the delayed response. In this case, no news is NOT good news. On the way home, I lost 2nd and 3rd gear. So, unfortunately, it is transmission related. :(

Thank you for your response, as I would have been happier with a fuel filter or fuel pump issue.
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Tuesday, May 4th, 2010 AT 11:54 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
That isn't good news. I was hoping it wasn't as involved. If that is the original transmission, there is no shame in its replacement. Still, before having replaced, ask a qualified trans tech to check the TCM to make sure the problem isn't related to the electrical system. Maybe you'll get lucky that way.

Regardless, let me know if you have other questions and what you find.

Joe
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Tuesday, May 4th, 2010 AT 12:10 PM

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