Hello guys im having an idle and throttle tip in misfire only and unstable idl afr ,swings to 12 then 17 then normal every now and then, cruise afr are on spot no misfires and on wot is good .on idle i cant push the throttle all the way down instantly the car will act as if theres no fuel in it but if i go smoothly it will go all the way to redline its annoying .No vacuum leaks ,changed plugs, does it sound like a bad MAF sensor ?

 

When my maf was bad, i had a weird idle, and some stuttering driving, felt pretty good at WOT but then started to dump fuel. How is your ICV? Do you know if it actuates? How about your TB? do you know how well that is sealed? These are issues I had with getting my car to run right. The omni 4 bar is like $100 on MAP, and its just a small sensor and quite expensive, but it solved my issues right away

Do you have evo scan? You can go into evo scan and watch values while idleing and it makes diagnosing the issue easy

 

actually i dont have evoscan yet im ordering today ...o have a 75mm boomba throttle body so idle control is made from the tune no iac thing in ny car thats what the previous owner told me (he is the tuner) and i have omni 4 bar map sensor on my car .when your car had a bad MAF did it threw any faults? As mine didnt and did your idle sounded like br br br 😰as if i have cams on the car sorry for beeing silly describing the sound...

 

Im on SD, but when the car had a bad MAP sensor it went quite a while before the car got bad enough to throw a code (the car died when i was at a stoplight, luckily limped it to work). I had been chasing the MAP sensor for a couple months before I found it. evo scan is the way to go

 

thanks you for the help will try to wait for evoscan before throwing cash on a MAF sensor

 

It'll be your fuel pressure changing.

 

what do you mean by that i have a walbro 255 and fuel lab fpr do you suspect one of them going bad