I have a strange misfire / hesitation that occurs only at minimal throttle. Its most pronounced at speed ranges 40mph - 65mph when there is no load. If there is a load (i.e. hill) or I give it a substantial amount of throttle it runs smooth. Searching through posts on this site has pretty much convinced me it’s the MAS or TPS. I'm looking to avoid the dealer if po$$ible. The engine light is not on. Will it still through a code? Any other suggestions??

1998 es300

 

Vacuum leak
Clean the EGR valve (Might as well the throttle valve & IAC valve & the rest of the upper intake)
Clean the MAF wire
Replace the plugs. I suggest NGK 5553's.

I highly doubt it's the TPS, or MAF outright. Anything's possible tho...