Car is sluggish under load
I have a 93 Bonneville SSE. No Mods, aside from a trailer hitch.
Last week, I started having a wierd problem. The car was acting really funny. Whenever I started it, it would run at a lower than normal RPM, until you tapped the accelerator... at which point it would level out and run normally. This wasn't all. It also was running very sluggishly whenever the supercharger boost guage passed the "zero" mark. If the needle was kept under the "zero" mark, it ran fine.
I figured it might be the battery terminals, so I unhooked both leads, cleaned them both, then reattached them. Little difference. I then replaced all the plugs and wires. The road test afterwards revealed that it was working great - for a while anyway. I then took the car for a 1 hour highway test to see if the problem was truly fixed, but within 1/2 an hour, the car was back to doing the same thing that prompted me to change the plugs in the first place.
I have been doing some reading, and might try replacing the MAF sensor- but am hesitant to go replacing parts on a hunch.
I had the car scanned at a local repair shop, and there weren't any codes stored either.
Have anyone run accross this problem?