Check engine code 36 for 89 dodge 350 ram - 1989 Dodge Caravan Cargo

SOURCE: engine diagnostic codes

I don't have a dodge ram but the codes for the dodge vehicles where pretty much the same. For my intrepid the codes read for the following numbers

12 - Problem with battery connection (This usually happens if you disconnect the battery)
21 - Problem with the oxygen sensor circuit
52 - Oxygen Sensor signal input indicates rich mixture during engine operation.

It sounds like you may need to change an oxygen sensor. Hope this helps.

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: what is check engine light code #P0016 on 2003

that is the code for cam/crank correlation sensor a bank 1
I would get it checked out

SOURCE: 2000 dodge ram check engine light came on. code p 0720 is

P0720 is a code for the output shaft speed sensor on the transmission. If you are handy with a volt/ohm meter you can test the resistance of the sensor unpluged. should be 500-700 ohms. or you can just put a new sensor in, its a comon problem.