1998 JGC 4.0 6cyl...Ok..here we go again..I had a crankshaft sensor replaced and ever since then it will start perfectly..but if you drive it before the engine warms to 240 on the guage, it jerks and the tach drops/raises erratically..once it warms up, it runs like it never had any problems whatsoever..well, except for a tiny miss here and there.( which I guess is acceptable at 200,000 miles, right? ) If anyone has any suggestions on where to start I would greatly appreciate it..before I pull what is left of my grey hair out..lol..thanks in advance all you Jeep geniuses.

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