Clacking sound at low speed acceleration, and this morning engine stumble.

[Blueberryyum02]

Sorry if this is a dead horse post. Been fighting a no heat situation on a 2002 ls v8 now this morning dropping kids off at school the car started stumbling like its misfiring also I have been hearing what sounds like a Diesel engine clatter, low volume crisp clatter sound at low speeds only at light accelaration can it be heard. Could this be the timing chain issue that was a problem on these motors, or a coil going out. I have no check engine light yet, will know tonight cause I plan on driving it to work. To see if any thing changes. Also if it's the timing chain how much to fix it at a mechanic or DIY.

 

[joegr]

What octane gasoline are you using?

 

[3.9-LS]

If you think a chain tensioner broke, you can pull the valve covers, or you can remove the lower oil pan. The broken tensioners usually end up falling down into the oil pan.

 

[Blueberryyum02]

Turned out to be bad gas. Thanks joer for pointing that out.