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Car stalling out

Tiny
RANCHERHONDA
  • MEMBER
  • 1991 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 142,000 MILES
1991 buick lesabre 3.8 auto, 144000 miles. After car warms up it starts bucking, usually a few times then straightens out. It is getting worse now sometimes even stopping engine.I put in neutral and it starts right back up.I have taken to mechanic and he says no codes are thrown. He put a used module and coil pack in. Didnt help. He then put in new cam and crank sensor. Didnt help. He now suspects bad ground or bad computer.I havent gone back as it is getting pricey guessing like this. Any help would be so much appreciated. Thank you in advance
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Sunday, March 20th, 2011 AT 3:18 PM

6 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Does it do this only at idle? Will it act up in park in your drive-way?
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Sunday, March 20th, 2011 AT 4:03 PM
Tiny
RANCHERHONDA
  • MEMBER
  • 5 POSTS
It starts acting up after 10 to 20 miles at any speed from 10 to 75 mph
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Sunday, March 20th, 2011 AT 4:08 PM
Tiny
RANCHERHONDA
  • MEMBER
  • 5 POSTS
Idles fine only acts up while going down highway. Before it acts up it seems to shift back and forth constantly and my mechanic says this is because engine isnt runnig properly and computer is telling it to shift
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Sunday, March 20th, 2011 AT 4:11 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did you try a test drive with tranny in drive instead of over-drive, any difference?
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Sunday, March 20th, 2011 AT 4:18 PM
Tiny
RANCHERHONDA
  • MEMBER
  • 5 POSTS
Yes ive tried just in drive, also with cruise turned off. All accys off nothing seems to help.
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Sunday, March 20th, 2011 AT 4:27 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I wondered about your vss/vehicle speed sensor. Your mechanic probably already considered that. I know you don't want to throw parts at it. Without something more to point us in the right direction, I don't know.
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Sunday, March 20th, 2011 AT 4:40 PM

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