Has to be throwing some kind of code. I'd go get it checked or sears sells a pocket reader for about $40 or $50 small and cheap now I can just google the codes

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2002 3.0 v6 2wd White with blue stripe
New tranny, heads, valves, wire harness, instrument cluster, CPS + sensor, free!brake pads, alternators, and starters for life! New MAF, radiator, hoses, coil pack and too much to list everything

Drive it hard, break it, and when you get to fix it you can trust it better.