Hello and good morning everyone.. let me preface this by saying I'm a newbie, not a mechanic, i just enjoy my f150 harley..

little back ground. unfortunately the last mechanic flashed the original tune and put a F150 factory tune. but it was doing shake before it was done. and no i didnt copy the tune(i know im an idiot)...anyways

So the problem:

when the Saleen supercharger(factory installed) engages the engine starts to shake. while the supercharger is not working the engine runs fine. it changes gear smoothly and runs normal.

So is this a problem with the tuning? the supercharger itself? has this happened to anyone? Any help would great appreciated!!!

thanks Gus

 

How many miles on the spark plugs, and which exact plugs are you using?

 

i just did a tuneup in august 2017 and they changed out the plugs, and flushed fuel line and brake lines. as far as the plugs they should ford plugs.. but maybe 5k miles since the service.