Q: What to check for intermitten loss of csp or ckp. on 2001 Dodge Ram 2500

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I have already replaced the crankshaft sensor and the pick up coil previously before this. What do in need to check out now. Thanks.
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It starts fine. It does not run right. It bucks and does not shift right when it's warmed up. Have checked the wiring and it looks fine.
Don't remember the code. I have a call into my mechanic who did not have time to look at the truck yesterday. I will reply back when I get the code.
The truck has 147,000 on it but the motor has been replace before I bought it and they could not remember how many miles on it be it was to be lower than what the truck has.