rpmorrison
Full Member
had my 2004 avy z72 1500 2 months now, today I installed new a/c delco iridum spark plugs and MSD wires, little struggle getting old wires off but not a nightmare others have had. avy runs great, alsome pick up smooth sound, took it into town(Fargo) notice a big differnce, it really seems I got 3 more gal per mile more. Before I was getting about 19 mpg and now 22. maybe just lucky but BIG difference. So thats that. I did leave the shields off.