91 b2600 intermittent hesitation issue.

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91 b2600 intermittent hesitation issue.
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mazdamanb2600
+1y
hey guys new to the forum havin a acceleration issue with my truck has 338xxx km on her but i love it and wanna keep her goin

so ill be accereating and sometimes it will either struggle and have no power for 1000-1500 rpm the kick in and go full tilt. sometimes its fine. and i have no problems.


ive done a full tune up on it.plugs wires cap rotor fuel filter ignition coill. ect.
also replaced ECU and Distributor with **Brand new parts not re maned. has proper timing in it however im sure the timing chains are worn. any help would be awesome. having trouble findimg technical help!! thanks!
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mazdamanb2600
+1y
also ran tests on the coolant temp sensor and it came back as normal. did a fuel pressure test it came back nominal and the fuel pressure regulator has been chamnged.
geterdun's avatar
geterdun
+1y
With the distributor being replaced, should not be bad module. I lean toward a bad ecu. I read on here alot about this happening and being that. Do you know anyone with a '90-'93 B2600 that likes you enough to let you pull and try there ecu?