I am not sure if this is where I am supposed to post this i'm new lol anyways, I have a 2000 grand prix gt with 213k some odd miles on it.... When I start it it idles really rough not sure how to explain it when first started it jumps for 700 rpms to about 900 really fast back and forth for about 5 - 10 seconds and then stops and every now and then it will randomly jump when idling and drop back down to where it about dies and than catches, also when I bought the car at 205k miles I changed plugs and wires and the crank censor and flushed trani