99 Tahoe Tune up

[1BAD9T7]

I have been told by 2 seperate dealerships to ONLY run the AC plugs... I tried the bosch platinum plugs many years ago, it ran like crap, my brother in law had a 98' Z71, ran the same platinums, ran like crap and would not pass smog. He put in the AC plugs, passed great, no other changes... Something about the vortec that didn't like those plugs... I would recommend what GM used originally based on my experiance...


Jason

 

[Whippled2dr]

I agree the stock engine I would stick with the ac delco plugs. On my s/c tahoe I run NGK TR6's but change them out every 10K miles.

 

[wicked2000]

I have heard 96 and up should stay with AC delco. The vortech engines run better with them and you wont see difference on the more expensive plugs.