Don't know if anyone can help. About 3 weeks ago check engine light came on no noticeable difference at time in performance. After about a week slight hestitation started and grew a little worse each day. Became so bad that I couldn't drive it any more no power. Whenever you try to rev it up it just bogs out and misses.Especially when it is put under a load. So I installed a new Distributor cap, rotor button,plug wires,plugs. No difference so I went to scrap yard, got an air flow sensor,no diff,got the Distributor no diff,got the throttle position sensor no difference. Checked over all my vaccum lines they are fine. Was going to check my EGR valve can't find it. Seems to have lots of fuel pressure. Anyone have any ideas. It is a 1992 Mazda B2200, fuel injected, automatic transmission,180000 kms. Appreciate any help.

 

mazbe the ecu try changing that.

 

Double check timing.

 

Mazda's line of light trucks offer reliability, utility and are very popular worldwide. The models and model years listed above, however are plagued by engine computer problems as these ECMs are also made by Mitsubishi Electric.

As with all Mitsubishi made units of these model years, the chemical leakage from the bad components is caustic and causes damage, sometimes irreparable, to the circuit board inside the computer. Symptoms include: no start events, injectors not firing, no spark, no diagnostic communications (codes), check engine light, rough running, smoke, etc. Any of these problems can occur in combination and be intermittent in nature. In our experience there appears to be no limit to the problems.

this came from avproecm.com

 

Do a compression test, sounds like a ring problem to me. Same thing happened to an old S10 I had.