1999 Tahoe, 5.7 Vortech V8, 125,000 miles
After replacing my Idle Air Control valve, fuel filter and installing a brand new battery, I have encountered a new problem. Prior to these replacements, my engine had a tendency to idle rough and to sputter, or misfire I suppose, especially when under load, i.e., with the a/c on or accelerating up a steep hill. Now, however, the engine seems to idle high when in drive and/or reverse and has begun to completely shut off when I shift into park!
I can say for a fact that I know I have at least one bad plug wire and have every intention of replacing them all once I have another free day to do so. Would this cause the misfiring and/or the stalling?
Also, if it helps, the, altenator, ignition coil and fuel pump are less than a year old.
I appreciate any responses and thank you for your help in advance.