I just purchased a 1998 Silverado with the 5.7 V8. It has about 157,000 miles on it and was owned by the same guy since it was new. He took pretty good care of it. This is the first full-size GM that I have owned. Here is my question: I'd like to do a full tune-up on it and wanted to know what people had good success with. So, can you guys reccommend plugs, wires, filters, fuel injection cleaners, any procedures that have proven to be the most effective for performance and gas mileage? I'm also interested in replacement intakes as well as any issues I should watch out for. Thanks!