Hi i recently bought a 1997 buick skylark. The guy said it was bad gas thats why it wouldn't start so i though't okay let me fix it up. Well i drained most of the fuel in it. And filled it up with 93. I changed the sprak plugs and booth. Also the fuel filter. The car takes a while to start. When it does start it won't idle you have to give it gas. I ran it for a little while. When you let the gas go it will stay on for a a couple of seconds idling really bad. I got an obd2 scanner and got some codes.


The codes are crackshaft sensor, Throttle position sensor, Cl fault fuel sys2, Fuel sys 1 ol. I think the fuel system is clean, but im not sure if it wasent will it throw these codes or do i need to replace these sensors? Some one please HELP.

maybe a loose ground. i dont know if anything else would effect all those sensors at once. or possibly the pcm.

your throttle position censer should fix your ruff idle problem.

and probably the rest of the problems.

but id put a new ignition control unit in it

probably to late for ya but... if anyone else has the problem theirs yer help. lol