Ok here is the deal I drive a 06 AT and I'm getting a bad sputter / misfire in 4th gear usaly right at 4500rpm, and most times when cruise control is set. If I don't change to 5th in manual the engine light starts flashing?? also when I park it rpms drop way down and almost bogs car out, and the sputter is starting to happen in 3rd now too. So my question is.....where is the problem?

Transmission (70k + never serviced) ?????? ( wish I had $300 to get this done)

Ignition ( replaced plugs and coils this time last year) ??????(I do have a full set of new plugs)

or something worse ??? (I realy hope it isn't a compression issue!!)

this problem didn't start until I replaced my K&N T2 with a AEM CAI, but I also added a throttlebody spacer, and cleaned both the maf and throttlebody.

Other mods that might have effect is my single res exoticspeed mid ( just replaced both gaskets) less than 3months ago, also have exotic speed r1-t catback system.

So what do you guys think???

 

thanx 4 the help

 

What codes are being set?

 

Does your AEM have the screens installed in the couplers? And if so, are you using both?
Is the VFAD nipple behind the TB capped?
What method and chemical did you use to clean the MAF?
Have you tried removing the TB spacer... remember that if you make a change and the car runs worse, start reverting back to what you had.
And yes... what code(s) were being generated.

 

ok , sorry it has been awhile.... still having same issues.
No i did not put any of the screens in
yes nipple is capped off
used ethanol/ carb cleaner for throttle body cleaning
and seriously thinking about trmoving my TB spacer
only code I have seen is 1-6, witch is the same vfad fault that made me wanna replace my k&n

 

You need a screen before the MAF to smooth the flow across it.

The typical code characters look like Pxxxx (x=numbers)

 

don't have a cpu reader, that's just the code that flashes through my airbag light, and will def put a screen in this weekend

 

UPDATE!!!!!!!!!!!!! engine blew up 2 weeks ago, but was replaced under warranty.......... all good now!!