my car has ran great , always been 99.7% reliable, sat. i changed my oil, got done, went for a drive, and:
1. it runs a little warm, about 220* ive checked it 4 times and all is good

2. the speedo isnt working all the time now, its kinda flakey, it seems to work like the tach, it goes up and down with RPM's, (No throttle it stay's at zero)

3. it has a miss in the upper RPM's( kinda a studder)

4. the Torq converter seems to just kick in and out on the interstate, it cand decide if it wants to be on, or off

i shouldnt have changed my oil

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Rich AIM: ONE FAST 2M8

did you check for error codes?

no check engine light

Maybe you need a new ground strap? [shrug]

Check the tranny fluid lately?

All of the problums could be eletrically related.

You didnt do *anything* but change your oil?

Was this oil change after a ' winter storage ' by any chance. All kinds of stuff like that goes wrong after you get it back out. If youve been driving it all this time and it ran fine, and ALL you did was change the oil, it has to be coincidence, it should have nothing to do with the other stuff.

as far as your speedo problem..try checking the VSS connector. I had something similar to that happen to me, and that was due to the little bugger coming loose.

i know its just a Concidence, its my daily driver, also i did tighten the alt belt aswell, as far as the VSS, i swapped it out about a month ago with the correct red gear and it hasnt give me any problems until now, but all is good as far as the connection, maybe ill swap the gear onto the other VSS and try that, as far as it running hot, it runs about 225* ish i m thinking maybe the waterpump is getting redy to die?
all cooling tubes are good, and i flushed everything out last may, so i knot that the radiator is good and clean, maybe i just have a little air bubble thats bieng a slut and dosent wanna come out, ut ive burped it like 5 times and its full

and the tranny was serviced like 8K ago (fluid and filter) by myself, and its still full and clean, but i think that has worked its way out, it seemed to work good to and from work.... all 4 trips today

so i think my only problem now is the running hot

I'm voting ground strap, too.....

did you tighten the alt. belt too much?