Not one to blast another shop. Just looking for others insights on whats wrong

This is a customer of mine that brought this car to me car pulls great wot, makes tons of power(dyno sheet shows 900+). however drive-ability is horibble. Will not come out the hole, stumbles very badly, cruising at steady speed there is popping and surging. Honestly you need a neck brace to drive more than 20 miles it surges so badly. I see a lot wrong, was just looking for other opinions on what to address specifically.
Car has sc
meth injection
93 tune
unknown cam
afr 6 bolt heads
nitrous


sorry did not get a log
has afr gauge in vehicle cruise afr's fluctuate between 13.0-16.0
wot afr is about 10.5-11.0