i have tried everything i can think of and im stumped the truck had the original 5.9 magnum and transmission well the transmission was going bad and i just went ahead and drop a motor and trans out of a 95 jeep grand cherokee everything mounted up and plugged in just fine but it will crank just will not start im not very smart with a lot of mechanics but i know quite a bit i changed the distributor pickup the cap and rotor all new and i changed the crank sensor still nothing i sprayed some starting fluid down its throat it fired off on 2 cylinders then nothing will not fire again i drove the jeep it came out of so i know everything is good new plugs freah oil fresh transmission fluid everything is good if anyone is able to help i would greatly appreciate it ive had this truck since i was 17 now im 22 im not ready to give up on it yet

 

It sounds like you've put a lot of effort into getting your truck running. Here are some things you can check:

Fuel Delivery: Make sure your fuel pump is working and that fuel is reaching the injectors. A no-start condition can often be caused by a lack of fuel.

Spark: Since it fired briefly with starting fluid, it suggests fuel delivery might be the issue. However, confirm you're getting strong spark at all cylinders. Use a spark tester if possible.

Wiring and Connections: Double-check all wiring connections between the Jeep engine and the Ram. Look for loose, damaged, or disconnected wires, especially grounds.

ECU Compatibility: The ECU from the Ram may not work correctly with the engine and transmission from the Jeep. You might need the ECU from the Jeep or a reprogrammed unit.

Timing: Verify the timing is correct. Even with new distributor components, incorrect timing can prevent the engine from starting.

Compression: If you’ve checked fuel and spark, test the compression in the cylinders to rule out internal engine issues.

Let us know what you've already tried from this list, and we can suggest more specific steps.