This exact problem came up about a year ago when it was still under warranty and the dealer replaced the crankshaft? at no cost and seemed to fix the problem until now. When first cranked the tach will go up and down rapidly from the 5 to 7 mark and eventually stall. Is ths a common problem and would the warranty cover the same problem occurring again now that its out of warranty? Thanks for any advice.
normally idle fluctuation on these is the tps, but 5-7000 rpm is a bit extreme. it could be it, but you may have a big vacuum leak. do you have a 4.7? engines with plastic intakes will shut off if they think they have a big vacuum leak. there is a pop out panel in the back of the intake that pops if it backfires and will cause this. check all vacuum hoses too.
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