Starting problem

'96 Toy Cam (2.2) 71K miles:

intermittent starting problem (in shop 3 times for it, once towed). Wasn’t the battery; wasn’t the distributor/cap; (3rd trip), mechanic said engine flooded & replaced seals…somewhere (wasn’t charged for it & no paperwork).

-low idle (heavy vib up front)

-usually doesn’t respond to more gas or putters out before I can hit gas

-cold or warm engine

-car cuts out instantly/dead when ignition turned off

-no warning lights on dash

-mechanic says computer does not indicate any problem when diagnostic run.

Is there such a thing as a ‘high idle’ adjustment?

Any one recognize the problem?