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Re: 96-99 454 Vortec owners?
Did the dealer reflash PCM? GM's factory tune to the lastest is quite different, they added the Towing Improvement Program and that will raise shift points and TCC lockup too. Great for towing, but bad for mpg.
94 Cadillac Fleetwood Brougham w/RPO V4P
00 Buick Park Avenue Ultra SC 3800
99 K2500 Suburban 454, Tuned by Me!
"Though I Fly Through the Valley of Death ... I Shall Fear No Evil. For I am at 80,000 Feet and Climbing."
- At the entrance to the old SR-71 operating base Kadena, Japan
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