not sure...the listing did not say

 

Well, I'd make sure because it makes a HECK OF A LOT OF DIFFERENCE!

 

ok...when I first got the car, I checked for codes...none. After I did all of the stated things to it, including correcting the timing, I checked codes again. It came up with 14 and 7...IAC and TPS. Did checks on wiring...all good. Reset ECU, all good, no more codes. Now I can adjust idle, I couldn't before. I put in some fuel injector cleaner, and my friend was parked behind me, when we looked at his bumper, and there was carbon on it from my exhaust. Could this be from cleaning the fuel system?