Have a manual pick up that hesitates and or seems like it is gasping for gas. on 1994 Mazda B4000

The problem gets worse with less than 1/2 of a tank of gas. Have already had both oxygen sensors replaced and fuel pump checked.This occurs everytime its driven and has been a problem for a long time.

by in Portland, OR on September 16, 2013
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3 answers 2 comments
ANSWER by , September 17, 2013
check your fuel pressure and replace fuel filter
ANSWER by , September 17, 2013
Any trouble codes?
COMMENT by , September 17, 2013
What is a trouble code? and what will it tell us?
COMMENT by , September 18, 2013
Is the check engine light on? If so there will be trouble codes stored in the computer's memory. You can have a scan test performed to see what these codes are to aid in diagnosing the problem.
ANSWER by , September 17, 2013
agree with both