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Thanks for your replies. I got an OEM valve this time and replaced it. The last leaking valve came from Napa. I thought their parts were better quality than the other chains but not in this case. Hopefully the OEM valve lasts longer than 4 months! Have a good weekend.

I have a 1997 Tahoe. The heater control valve leaks constantly. Actually it is hard to tell if the valve is leaking or coolant is coming from where the hose connects to the valve. I have changed the valve twice and replaced all hoses and clamps. . No leaks will occur for a few months and then...

Found problem The issue ended up being a bad fuel pressure regulator and a bad injector poppet feeding cylinder 5. Cost me $340 total parts and labor. Other shop wanted $1400 to redo the heads due thinking it was a burnt valve. Thanks for everyone's suggestions.

Thanks for the advice. I will look into this as a next step.

Thanks for your recommendations. I have read alot about the spider injector being an issue with this model. I will check those items first.

I have a 97 Tahoe LS, 5.7L, with 183K miles. The idle is rough only at a stand still, otherwise runs smooth at all speeds. Code check provided P0300 Random Misfire. Ran multiple Sea Foam bottles to clean injectors, removed/ cleaned throttle body, replaced EGR valve, changed plugs/ wires, fuel...