Why does my truck have a miss and running lean?

Asked by Jun 28, 2017 at 07:06 AM about the 1999 Chevrolet Silverado 1500 3 Dr LS 4WD Extended Cab LB

Question type: Maintenance & Repair

I did a full tune up. Temp sensor changed good
valve pressure good fuel pressure. The only thing I
did lately was put a throttle body spacer about 3
mouths ago. My truck is a 98 chevy 1500 5.7

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