The power
sounds like your brakes are not releasing properly
2004 in the Grand Cherokee
A loose belt on the motor.
the timing is off make sure that you timed it to piston #1 i have a 1991 wrangler that had the same problem when i rebuilt it.
There are pages and pages of things that can cause a check engine light. Have the code checked with a scanner.
i would check the cranking circuit,starter,starter relay,ignition switch,neutral safety switch.
It will If you willing to do the work the radio harness is different and the radio trim bezel changed in 2003 so you would have to make it work.
It could.It could.
First try the map sensor. If that doesn't do it, then the fuel pump should. It is normal for that generation of Jeep to have a longer crank time.
the problem with your jeep is call the safety neutral switch located under the counsel to test to make sure try to start the jeep in neutral if it starts that's the problem its an easy fix
Jeep is the make. It is also part of Chrysler LLC.
Jeep is a make in its own right. It is produced by the Chrysler corporation .