Originally Posted by
Montecarlodrag
None of those codes will cause the engine to run poor.
Copy the MAF and VE tables from the 98 tune to the new one, then multiply the whole tables by 1.3 and test again.
If the wideband still reads lean, use the scanner controls to command a richer AFR while scanning. Start with 14.2 then enrich it half a point at a time. The engine should run much better.
If it doesn't respond to these changes, you have a problem with some cylinders misfiring, a mechanical problem
or something else that needs to be addressed before messing with the tune