i HAVE CHANGED ALL MY FUILDS, TRANNY, DIFF, FUEL FITLER, COOLANT, AND SPARK PLUGS THIS PAST WEEKEND. AFTER THAT MY CAR WOULD IDLE FUNNY WHEN IT WAS HOT AND I WOULD START IT. IT WOULD GO UP TO 2K AND DROP TO LIKE 7OORPM, AS IF IT WANTED TO STALL. THEN GO BACK UP TO LIKE 1,2K. I AM, WONDERING IF IT IS BECAUSE I DID NOT TIGTHEN THE SPARK PLUGS GOOD ENOUGH?? WHAT ELSE COULD IT BE.

 

Ferchrisake DON'T SHOUT!
If the plugs weren't sealing, you hear it! It'd be like running no mufflers. Check them, but DO NOT overtighten them. Sounds like a vacuum leak. You way have disconnected or dislodged something while doing all that work. Check everything's on and securely connected.