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Meanwhile 13 years later . . .
The above mentioned website appears to not have a tech section anymore and I didn't find a mention on their FAQ page. In case anyone else was curious about what they said I was able to find it here . . ...
The Solution to my Issue
I would like to thank everyone who took the time to offer suggestions and advice. With the limited information I gave, all of your responses were valid and I appreciate your input. Special mention to @trippled and @Tim_MN. I checked many of the things suggested by...
I tested the TPS using the chart / procedure described here . . .
https://www.cherokeeforum.com/f2/throttle-position-sensor-219877/
I had two exceptions;
a) The TPS signal that should have been > 0.26 volts but < 0.95 volts was 0.973 volts. While this only 0.023 volts too much. It is still...
I think I found how to test the TPS. I will do that first since it seems fairly quick and easy. Even though it was replaced a few days ago it was from Advance Auto and not OEM. Then I will see if I can figure out how to test the CPS, ECU, TCM if still necessary. I will buy the manual...
More information. This morning I tapped the brakes. The rpms did go up as it should. However I think the following may be helpful. Anytime the jolt was happening I could tap the brakes and give it slightly more throttle and no more jolts. Or I could anticipate the jolt and before it...
Great idea on the brake trick. Will try tomorrow morning. After a lot of reading I was leaning towards attempting to test the TC solenoid. I think I saw where it is solenoid #3. No idea where that is. I will try and found out the test procedure for that solenoid.
Thanks.
At this point I'm not ruling anything out. Maybe I don't know what a misfire is but the pattern is it only happens in either 3rd or 4th when it is about to shift down. To me a misfire is when one or more cylinders stop producing power.
The jolt I'm feeling is more like all cylinders decided...
99 XJ - 4.0L - AW4 - NP242 - 175k Miles
4" Lift, 33" Tires
Trans Fluid & Filter Changed 10k Miles ago
Owned as a DD for 18 months.
Thanks in advance for any help. Haven't had any real problems until about 2 weeks ago. The issue started very slowly and is now constant. Hope I can describe it...