When I think I might have a bad wire or coil, I wait until it gets dark and look at the engine while it's running. Just look for the spark. You probably knew that trick, but if you didn't... ;)
Here's the non led tail lights I got on ebay. I had searched the forum, but couldn't find these installed on anybody's Tahoe. Really like them so far. Makes the back up lights super bright!
Had an old Chevy do what you described once. I thought the trans was screwed. Tried it next day after it had cooled off and it never did it again. I was running it hard. That's why I asked about trailer. Sounds like it was loaded down though.
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Think I have the same clunk. I'll update this thread if I figure it out. Thought it might be the spare, but it doesn't feel loose.
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The cat on my Camaro broke into pieces and plugged up the muffler. I don't recall gas mileage going down when it happened, but it ran like a new car when I installed a new muffler.
Sounds like parts of the cat got into the muffler. I don't know if it would hurt mpg that much, but probably a good place to start. My guess is that it's getting too much gas and that's what messed up the cats. Was mpg down before cats had to be replaced?
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