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Message: <blockquote data-quote="MustangChris" data-source="post: 628869" data-attributes="member: 10830">"I am going to take the car into my school shop on friday, and do the brakes then. Atleast resurface them, and slap some pads. That should fix your problem.  but dont go too thin on your rotars, or they will just warp again and then they are a MAJOR safety problem. I'm sure your school has a tech that knows what they are doing and what final specs should be (i dont know what final specs should be.... lol)"I must have a true limited slip. I almost got the royal purple diff fluid today but they only had one quart, so I passed. Where do I get the frpp stuff?"the only way to tell is if you jack up the rear and spin a tire. if one goes forward, and the other backwards, you have traction-lock (stock from ford and standard equipment on GT/Cobra mustangs) if you have t-lok, you do not need the fluid. if both wheels go the same direction, you have limited slip, and you do need the FRPP fluid.Royal Purple is all that I use in my drivetrain. I HIGHLY suggest it for your diffy and tranny. you can obtain the FRPP fluid from any ford dealer, you can get the part number of <a href="http://www.fordracingparts.com" target="_blank">www.fordracingparts.com</a><a href="http://" target="_blank">http://</a>I havent replaced tranny fluid yet. I know its Mercon V ATF because I have changed it 3 times in class on other peoples cars.The car shakes pretty good at idle, You can see mirrors,seats, engine shaking and all kinda ****.I did most of the sensor cleaning you described except, IAT and replacing 02's. The spark plugs have maybe 100 miles on them. I didnt gap them though maybe I should do that."I havent replaced tranny fluid yet. I know its Mercon V ATF because I have changed it 3 times in class on other peoples cars."Yea, I just use Royal Purple ATF fluid."The car shakes pretty good at idle, You can see mirrors,seats, engine shaking and all kinda ****."if you have a friend with the same year mustang, swap MAF sensors. also, it could be a vacuum leak (maybe??)"I did most of the sensor cleaning you described except, IAT and replacing 02's. The spark plugs have maybe 100 miles on them. I didnt gap them though maybe I should do that. "the IAT sensor is the small sensor in the intake pipe right behind the MAF sensor. Just use CNC MAss Air Flow Cleaner on it, that will do fine. Also, I think if you replace the o2s, it would really help. And finally, check your plugs. Now that they have a few miles on them, you can see if there are any major problems going on in the combustion chamber, detonation, rich, lean, carbon build up, etc.</blockquote>