In my opinion, the first thing you need to address is the misfire. This COULD be also causing the hard shifting.
Case in point, though not directly related was a 1996 Ford Explorer. Lady thought the transmission was going bad because of delayed and hard shifting.
Upon test drive and then investigation it was found the catalytic converter was partially plugged and after replacement, transmission shifted as normal. The engine wasn't 'breathing' correctly (too much back pressure) so the lower torque of the engine wasn't allowing the transmission to 'see' the power so a delayed and hard shift was the result.
In your case the engine isn't producing the correct amount of power due to the misfire at part throttle which could delay and harshen the shifts. While 'getting on it' would increase the RPMs and 'mask' the misfire so the transmission would appear to shift 'normal'.
Hope this makes sense and is of some help.
SOURCE: transmission shifting problem[automatic]
the next step is to have the service trouble codes run to see if any trans related codes pop up, here is how u do that, go to the link for instructions, let me know what u find if anything, but that is the 1st step in the further diag of this problem
http://check-engine-light-codes.blogspot.com/2006/04/chrysler-1985-95-obd1-code-self.html
SOURCE: 03 JEEP wrangler Rubicon 4.0L missfire on cylinders 1,2, and 3!
bad fuel pump can cause this or plugged fuel filter but i believe they are one unit
SOURCE: 1999 grand cherokee laredo 4.0 and auto trans wont downshift
The Transmission Control Module also turns on the check engine light. However the parts store won't be able to read these codes since all they read are the Engine DTC's. More then likely your codes will come back to a Governor Pressure Sensor and/or Switch. If they do then remove the pan and replace both of those. Simple fix, should be able to be done in about an hour or so. Might as well go ahead and slap a speed sensor in while you're under there. Should be able to do it yourself for less then $200.
SOURCE: cylinder 1 mis fire on with 4 l
You could try an additive to go in your fueltank, in England its called Redex or STP, that may help as they are designed to brake down the carbon build up
SOURCE: 98 grand cherokee cyliner 1 misfire,, HELP ..
it has cap not coil pack , you try decarb might get lucky any ticking ? next is leak down on the cylinder and determine weather rings or valves how many miles wheat are the engine codes now check and the plug again , did it have misfire on the same cylinder before you worked on it adn after you worked on it. What is running compression. all these answers are to answered some you can do some will need more tools.
Testimonial: "whats decarb.. ??? and whats leak test on the cylinder ? please help ..."
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