At sixty MPH engine begins to stall and loses power

2000 PONTIAC FIREBIRD
113,000 MILES • V6 • 2WD • AUTOMATIC
Avatar
ANNETTEDRENNAN1
  • MEMBER
  • 1 POST
Drives fine until about 60 miles than starts to stall and lose power won't go faster than 60. will gradually start decreasing then surges back up to 60 but will not go over that speed. goes fine driving in town.
Apr 11, 2020 at 4:09 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
Good morning,

I would start by having the fuel pressure tested. You may have a weak fuel pump not supplying enough pressure to keep up the engine load.

https://www.2carpros.com/articles/engine-has-low-power-output

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Another possibility is a clogged cat converter not allowing the engine to breathe correctly. You need to have the back pressure tested for excessive back pressure.

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

Roy
Apr 11, 2020 at 7:13 AM
Advertisement