I started having a rough vibrating when at idle today. The idle itself is stable...not jumpy. With my hands on the wheel its very noticable and strong. I feel like its going to shake apart. engine runs strong and pulls hard. it also boost fine as well.

Changed plugs (9's all around) 6,000miles ago
added twin power less than 1,000miles ago

Has anyone had these symptoms or have any ideas.

 

If it is most noticeable ~3K Check water pump, drive belts, pulleys.

General Rule of thumb, If you feel it in the steering wheel, problem is in front of vehicle, If in your butt, flywheel back.

 

its at idle 800-1,00rpm

 

Still, check the belts and pulleys closely. See if you can feel it whilst putting a hand on the motor. If you have a stethoscope see if you can hear anything. If not use a length of fuel line or vacumn tube.

 

Yes i can feel it while placing my hand on the engine. My belts look worn. The alternator belt has a tare and the rest are cracked. Forgive me, I don't fully understand how belts or pullies could cause vibrations.

 

Trust me they can, have seen enough to say that could well be your problem especially if you are missing chunks of belt material.

If you are missing a chunk out of one it can cause vibration. They are a rotating mass hitting and running across many pulleys and surfaces.

If they have more than 4 cracks per inch they are suppose to be replaced.

 

thanks a lot. doin it this weekend