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Senior Member
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Join Date: Nov 2018
Location: SoCal
Posts: 1,298
Real Name: BLACK TRD PRO
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Senior Member
Join Date: Nov 2018
Location: SoCal
Posts: 1,298
Real Name: BLACK TRD PRO
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Did they install the same part number OEM Denso plug that they removed? There are a few different manufacturers for our 4.0L. If not, this may be a problem based on the heat range of the plug. Although, most of these plugs come pre gapped to the correct specs, I always double check the gap. If it is running smooth, I doubt a vacuum line or a plug connection is loose. Did they inspect your plug wires and coil packs? I doubt it. Being 7 years old with 120k I might have considered a new set of plug wires.
There are so many variables to onboard or self calculations, I.e.;air temp, humidity, wind, tire pressure, etc.
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