I have a 97 lude. Recently, when I drive over 50mph, the engine starts to vibrate when I press on the accelerator. Don't think it's the balance or alignment because it only happens during acceleration, worsens at higher speeds. Also, it doesnt happen when I rev the engine in neutral, only when driving at high speeds Anyone know what this could be caused by?

 

might not be your engine, and could be just a wheel alignment issue

 

could be your axles, or wheel balance / allignment issue.

 

Like I mentioned before, it only happens when i hit the accelerator. Talking to some people they said it may be my spark plugs or wires, anyone hear of this before?

 

as weird as this might sound, check your exhaust. are you running stock or aftermarket? either way, make sure your hangers are tight. I had a loose hanger, wound up cracking my flex pipe. I put on a new flex pipe and tightened up the hangers and the vibration stopped. Could be something simple like that

 

jonnywu I had the same exact thing, at certain speed it would vibrate more then at others and would vibrate once I hit the throttle... It was a bad Axle

good luck buddy.