[yelcab1]

Originally Posted by matt demaria

First of all you are introducing possible problems with a universal o2 sensor. Use the OEM one. Then I don't know whether the lumpiness existed before, or happened after you worked on it. You can draw some conclusions here.
If the lumpiness existed before I would do a compression and leakdown before I did anything else to make sure the foundation was good enough to invest time and money into it (not knowing the history of the car). Check spark plug wires with a scope to see if they are shorted or open; Look for about 10kv at idle. If they are all consistantly high (15 or 20) I would check the CO to see if the engine is set too lean. If they are all consistantly low (5kv) I would check the mixture to see if it is too rich.
Use the factory procedure to check CO and a BAR 90 certified CO meter (not gunston)

A compression test was done by someone else a few weeks ago with very good high numbers and all even across the cylinders. I do not have any of the professional scopes to check high voltage tensions {10Kv} or a BAR 90 CO meter. I do have a gunson and likely not accurate enough for this work.