Thread: No Idea What the Problem Might Be

If this is in the wrong section, someone please move it.

I have a 1998 Grand Prix GTP (Supercharged) with no mods at all except the Transmission was replaced a couple months ago. Transmission was from a Buick Regal (Same transmission as the 1998 GTP)

I made a few videos while I was driving...Maybe one of you guys can tell me what might be the problem with my car. Engine? Transmission? Torque Converter? I don't know...

While I'm driving you can see the speed consistently increase (I never change pressure on the gas peddle), but the RPMs stay the same for a bit then rapidly jump up and the speed increase at a faster rate too.

You can see in all the videos it gets to 23000-2500 RPMs then Jumps about 500 RPMs.

If anyone has any ideas I would really appreciate it. Don't mind the music playing in the background haha

10-11 seconds into the video it happens.

Here is another video (10-11 seconds in it happens)

And here is the 3rd video (10-11 seconds in it happens)

It sounds like it is just shifting back down maybe?

It's after it shifts.

Ya but is it going from 2nd to 3rd then back to 2nd again? when Mine shifts at lower RPMs it usually only bumps up or down 500-700 Rpm.

Originally Posted by jwach

Ya but is it going from 2nd to 3rd then back to 2nd again? when Mine shifts at lower RPMs it usually only bumps up or down 500-700 Rpm.

Sorry, but that just doesn't make sense to me when the car is going faster not slower.

Originally Posted by BrandonHall10

← not an expert...

That being said, looks like the TC is unlocking. (?)

Anyway to check this?

So my best bet is probably just take it to a shop?

Thanks everyone I really appreciate that. I'll try the 3rd gear thing scotty

I had cracked front plugs and my car did something similar to that.

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