i may need a tune up
 

I'm new to the mazda forum, and i have a 1994 Mazda B4000 4WD. i took it to a shop and got them to read the codes for me, and i had O2 sensor code and a misfire code. the mechanic told me that it could be plug, wires, coil, or injectors.... well i changed the O2 sensors and plugs and wires. the problem im having is at full throttle.. it seems to bogg out, but if i hold it at half throttle the rpms seem to be alot smoother.. any help would be great !!

james