Sitting in the Ole girl at a light. I noticed a slight vibration while in gear. Get home. Put her in park and noticed it again. Took her for a spin again. It seems to do it at low speeds, crusing and goes away once I'm on it?

What would be a good starting point to track this down?

Thx.

 

Not much info to go on. Maybe an injector starting to act up?

Check for codes
Injector buzz test
Bubble test
Fuel filters and a strong dose of fuel Addative
Battery/charging system check
FICM check
Fuel pressure check

 

-FP-65@ Idle - Hard acceleration, 54
-No Codes
-FICM 48 volts
-FLP 13.5
-Charging voltage 14.36 @ each battery
-Fuel filters, all changed 4100 miles ago.
-Archie 6200 getting ready to fill up with.

Injector buzz and bubble test not done yet

Thx, for the reply.