You got a major problem , may be the oil pump but more then likely you have a worn piston shaft. What i mean by that is the piston uses a rod to connect it to the crankshaft when the connecting shaft get worn it will knock . Stop driving the auto have it have it checked out ASAP if you don't you stand a chance of putting the rod through the engine. Then it toast. Good luck.
SOURCE: 2004 jeep grand cherokee idling problem. Revs motor 200 to 500 rpms higher while driving.
I had the exact same problem on my 04 GC. I put some Techron Concentrate Plus Fuel System Cleaner in from Wal-Mart and it seemed to fix the problems right away. Let me know.
SOURCE: When car is idle it will rev from 2000 rpms to
You have a vac leak. It's related to cold vs hot. Possibly throttle body gasket. IE: when it warms up the metal expands and seals the leak, when cold it contracts and exposes leak.
SOURCE: engine idles rough at red
You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.
Testimonial: "checked fuel filter and changed it, I did notice a high pitched hissing when idling only noticable s tanding outside of car with hood closed, possibl"
SOURCE: truck starts fine and idles ok. spits and sputters
CLOGGED FUEL FILTER OR CLOGGED FUEL INJECTORS.WILL CAUSE SPUTTERING AND MISFIRE.LEAKING EGR VALVE WILL CAUSE ROUGH IDLING SPUTTERING.
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