Transmission slow acceleration

2004 CHEVROLET MONTE CARLO
205,000 MILES • 3.4L • 6 CYL • 2WD • AUTOMATIC
Avatar
TMAC SOLORIDER
  • MEMBER
  • 1 POST
About 2 weeks ago after getting off work I was on the high doing about 65-70 mph and out of no where my car started jerking and down shifting. so I got off the highway to check the fluid levels on the engine and transmission both were a little low. so I topped them both off got back on the road and noticed I had a very slow acceleration the jerking stopped but the slow acceleration started. Today I changed the fluid and filter in the transmission but still doing same and now it has a whistling noise. what could be the issue?
Oct 20, 2019 at 12:48 PM
Advertisement
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,647 POSTS
Hello,

It sounds like you have a catalytic converter that has fallen apart and is blocking the exhaust system lowering the vacuum in the engine causing the transmission to act up. To be sure here is a guide to help us:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

See if you can gently bang on the exhaust to see if you can hear any rattling. Can you please shoot a quick video with your phone so we can see what's going on? that would be great. You can upload it here with your response. Please run down this guide and report back.
Oct 22, 2019 at 6:26 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle