MineralGrey

Hey, I recently started to notice after a bit of driving my car idles pretty ruff it tries to stay at 700 rpms but drops every second or so to 500 it almost feels like its going to stall, here is what I have done so far to try and fix it, new coil packs and plugs, carb cleaner for the IAC, cleaned the MAI, I put back the original IAC gasket, took off MAI screen, Unplugged the battery for 5-7mins, but no results the only conclusion I have left is a vacuum leak but I can't seem to find one. any advice is appriciated!

MineralGrey

no one eh?, guess I'm going to have to take it to the stealership then.

H0SS302

check your lines. proble a crack starting to develop in your vacuum lines or something like that. do you have an aftermarket intake(cai or rai) check the fitting that connect the tubes.

MineralGrey

yea I have a CAI, TB and TB plenum, there wasnt a gasket beteween the throttle body plenum and intake manifold when I took off the stock one so i didnt put one in, but that was ages ago and the car ran fine. Althoug on the CAI I did notice a few cracks in one of the silicon boots but it didn't seem to go all the way through.

H0SS302

i just had to fix mine because of the crack i had in mine. it was ideling around 1k then would drop to almost 250.. but now its fine

MineralGrey

well I figured out that my tune went bad some how, it was running really lean,so I have to drive with factory hp tune and it wont calibrate the speedo for the 4.10's. Sat I'm going to have it dyno tuned for 250.00 hopefully they will fix the speedo calibration cause I can't seem to fix it.