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I think on the 1999 V6 the firing order is 1-6-5-4-3-2. Stand with the engine pulleys and belts nearest to you. The cylinders are number as Odd and Even. The LEFT side is the EVEN numbers, (2-4-6). Number Two is nearest to you and Number 6 is furthest away from you. The RIGHT side is the ODD numbers, (1-3-5). Number One is nearest to you and number Five is furthest away from you.
connect tach wire to negative side of ignition coil and ground anywhere you find a good surface for the ground. there should be instructions that came with tach.
Both the 2.0 liter 4-cylinder, and the 2.5 liter V6 are overhead cam engines. While all years of the V6 us hydraulic tappets, the 4-cylinder engines varied. From 1998 and earlier, they had hydraulic tappets. From 1999 on, they used shimmed mechanical tappets. Adjusting valve clearance on the later engines is a little involved, and, if you're not familiar with the procedure, it is perhaps best left to a professional mechanic who is familiar with the engine.
sounds like a problem in the PCM. a more sophisticated diagnostic computer is needed to test the system out, most repair shops should have these. i would get multiple estimates from different garages and one from a dodge dealer.
there are a few different engines. A 3 liter with or without a distributor, and a 3.5 liter. All V-6 engines have firing order 1-2-3-4-5-6. See figures below:
Put a long prybar in the way of the fan blades at the base of the fin to keep it from turning.
Or, if that doesn't work, use a pneumatic impact ratchet or 3/8" impact wrench to unscrew the fan more easily while holding the fan blade with your hand and a rag.
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