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Ya, you might be right, but there probably isn't much difference between the 2002 and 2003 years, at least for tune-up procedures. In any case for $15-20 how can go wrong for reference material. The manual you probably want is:
Haynes # 24066 - Chevrolet Silverado & GMC Sierra Pick-ups, 1999 thru 2002, Chevrolet Suburban & Tahoe 2000 thru 2002, GMC Yukon & Yukon XL 2000 thru 2002.
At least until a newer one comes along.
Amazon has it under "Chevrolet and Gmc Pick-Ups Automotive Repair Manaul". A search on this will get you within a few selections. The book isn't just for Pick-ups, as you can see it covers Suburban, Tahoe and Yukon also.
When you get the book, and have a chance to look it over get back to us and we'll take it from there.
By the way, how is(are) your trucks running? These days tune-ups are good for 100,000 miles, and unless you have some symptoms I wouldn't mess with a "just in case" tune-up.
Hear from you soon
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