Well a lot of things within the last month. I have a 97 dodge Dakota 3.9L Sport model. I am having stumbling issues for a month now. I have checked compression and leak down test in all cylinders and its within specifications. I did have a check engine light P0300 P301 P302, I replace my tps, spark plugs, distribritor, rotor and min coil. I just did a fuel pressure test and the pressure and idle is 47 lbs but rapidly moves the needle and when the truck is shut down is loses pressure immediately. I can't figure out if its the regulator, fuel pump check valve or its a leaky injector. I currently drive, it stumbles up hills but idles down hill great. I did notice my rpm gauge fluctuating at least 100 rpms while climbing hills. Any ideas?
JA: Does the light stay on, or does it blink?
Customer: After I changed the tps the light is gone and never returned
JA: Are you fixing your Dakota yourself? What have you tried so far?
Customer: Yes, I did the spark plugs and gapped, wires, distributor, rotor, main coil, cleaned the battery
JA: Anything else you want the mechanic to know before I connect you?
Customer: This truck is awesome when it works, lol