#127005, "RE: weird idle, IAT CEL, IAT readin -40 WTF!?" In response to In response to 0 Aug-02-09 08:07 PM by phr0st187
Check for vacuum leaks, change the IAT sensor, and also check the TPS and MAP. Because a 420a runs on a speed density system, a faulty IAT can have quite a negative effect on engine operation.