Welcome Scott, My 2001 4.7 does the same idle trick under the same
situation. Go with cat back 3 inch out single or 2.5 inch duals and cool air
K-N. 180 degree thermostat for starters.
SEMIHEMI01 (Bill C.) 2001 QC, 4.7L
5spd. 3.55 LSD, K-N Cool-Air
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