I have a 2000 Mazda b4000 4x4. Lately it has been almost choking itself out. on 2000 Mazda B4000

If I try to go at a steady speed it will start choking. When it happens I pin the gas and it will stop till I try to get speed or go at a steady speed. I feel it on the gas. It doesn't do it all the time but is becoming more and more. I have cleaned my mass air flow sensor, changed my vacuum hose. Does this sound like a fuel/air problem or a possible throttle problem? The gear shifting(automatic)is a little rough lately too.

by in Oroville, WA on November 05, 2012
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2 answers 2 comments
ANSWER by , November 06, 2012
have you repl fuel filter? if so do a fuel pressure test while driving under load to see if you are loosing fuel pressure
COMMENT by , November 08, 2012
Thank you. I will change fuel filter plus a pressure check.
ANSWER by , November 06, 2012
Check fuel pressure under load
COMMENT by , November 08, 2012
Thank you. Will do that.