SOURCE: 2001 dodge ram 1500 v8 spark plug wire diagram
the firing order is 1 8 4 3 6 5 7 2 clockwise around the cap
SOURCE: thermostat in 2001 dodge ram 1500
the thermostat is located where the upper radator hose comes off the engine there are two bolts or nuts remove hose and remove housing you will see the thermostat when you do clean old gasket material off block and reverse removal procedure
SOURCE: check engine light on code
cheapest thing is get new gas cap, next make sure no vacuum leaks anywhere, the you may need to replace evap purge valve. these systems are junk on all cars and will make you spend lots of money.
SOURCE: check engine light on code
This trouble code is Evap Purge System Performance fault. 1) Check for a loose or missing fuel cap. 2) Check for a damaged or missing fuel cap seal. Recheck for other trouble codes. This fault wont cause the stumblering problem. It turns on the MIL lamp to say there leak in the EVAP system.
SOURCE: Dodge Ram 1500 4x4 Engine code P 1687
No Cluster Buss Message is codeP1687. May be a cluster problem obviously but appears other things can cause it also. With price of a new or used cluster I would try a few things like pushing diagnostic button on dash, and let it go through the steps, as well as a battery disconnect for a few minutes then reconnect, just to see if you get lucky. if not, make sure you get assurance that whatever the repair shop says is wrong, if it doesn't cure the problem, you don't pay. Sounds like a lot of misdiagnosing being done on this . Sign up on the Dodge Truck forum, for more input. Good Luck
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