Just replaced all the spark plugs. idle is at a steady 900. For some reason, rather I'm in reverse or drive she shakes like crazy and hesitates when trying to accelerate. other than a vacuum leak, what else could this possibly be?
Double check and make sure you have the wires going to the correct spark plugs.
Then, make sure your wires are properly seated on the plug. When you installed the new plugs did you start them in by hand first, and then use the wrench? If not, you may have cross threaded a plug. Can you hear any hissing type sounds?
Current Vehicle: 2012 Black Mustang 3.7 with a k&n 69 typhoon sieries CAI Ford racing Strut tower brace Forgestar f14s on the way 😈 | Past vehicles Ford ranger | 2001 Jeep Wranger | 2007 White v6 mustang |