MY TOYOTA 3.0 TRUCK CUTTS OUT AND ITS NOT FUEL PUMP OR TPS COULD IT BE MASS AIR SENSOR ?

Earl

1993 toyota dlx 4x4 pickup with a 5 speed manual tranny. already replaced tps, fuel filter, plugs cap wires....no codes, I think there is an exhaust leak before the o2 sensor but small which would cause it to run rich. Its stumbling and hesatating...it will go good if I floor it though. also replaced the muffler with a big quiet one...might hack that back off to see if even new it has something in it that would cause blockage intermittantly.Opened the maf sensor and all was good as far as I could tell, sprayed it all reall good with maf cleaner and reinstalled, new air filter....acts the same,,,,might be fuel pump but when I floor it it goes good !......Ideas ?

HOLEY MUFFLERS

could be.































respectfully,















there's a reason for no replies here,















give us a clue,































taco, runner, tundra, manual or auto transmission, year?????????????????????????































you can go to this pg. dl the app FSM, go rent a scanner (post '95), or have it blink at you (pre '96), and pull some codes. or ask a shop to do that.































EDIT, sorry, forgot the link to the FSM,















http://www.ncttora.com/fsm/1993/index.html































first thing should be a "complete full" tune up. good baseline for trouble shooting, the issue maybe that simple. the cost of a tune up is peanuts compared to what it used to be. go from there. w/o trouble codes, we need more info. cuts out or dies? idle or under load? engine hot or cold? otherwise idles or accelerates smooth?































w/o codes, these are the things we need to know.















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EDIT,































manual trans, good, not in the mix.































i know you say "no codes".















not all codes prompt a light, i suggest pulling the EFI main fuse for 30secs (that will clear any prior codes that may have been addressed and are not relative now). start it.. the ecu should gather a new baseline. if anything is not within specs, should show up during this process,















http://www.ncttora.com/fsm/1993/engine/85diagnosi.pdf































also, here's a trouble shooting chart,















http://www.ncttora.com/fsm/1993/engine/63troubles.pdf















all management components in question for specific testing can be found here under 3VZE "MFI sys",















http://www.ncttora.com/fsm/1993/engine.html































have you checked egr/pcv?