All that was changed last winter, I got the car form the original owner and he said it has always had an idling problem since new.
He's not mechanically inclined at all so he did nothing for it or take it in. It does run great, Ive been trying to figure it out for about a year now, just been actually driving it for a month or so.
See the "Surging Idle Checklist”for help with all your idle/stall problems. You can guess at the problem and throw parts at it, or you can use the checklist to help you find the problem quickly and inexpensively. The checklist is right here in the Stangnet 5.0 Tech forum and you don’t have navigate to some other unknown web site. It‘s free and doesn’t cost anything: at last count there were more than 103,000 visits and still climbing
The quick and easy way to dump the codes is in there too, and all you need to do it is a paper clip! The first two posts contain all the fixes & updates. At last count there were 24 possible causes and fixes for surging idle/stall problems. I continue to update it as more people post fixes or ask questions.