94 2.3 4x4. rough idle, delayed accel. help if u can, please and thanks
 

94, 4x4, 2.3, manual. ive had a rough idle with this mutha ever since i bought her a year ago. sometimes its bad, sometimes not so much. ive looked for vac leaks, checked pcv, new plugs and wires, checked coil packs w multimeter, new iac valve, new tps. it sounds like its misfiring after sitting at idle for a bit, rpms are fairly stable but the truck can shake bad. recently (been getting cold out) truck has been real bogged down when accelerating from a stop. just "put put put" with pedal to the metal, then "vroom" it catches on. a dude i work with told me to check out my thermostat (without a working one the injectors will never work right) so i replaced that, and from the looks of the old one, that was a good call. still truck inconsistantly has that bogged down accel prob, which happens in any gear (full throttle, "put put put" then "vroom"). now back to the idle, when it idles real bad i can pop the hood, unplug the mass air flow sensor and BAM it clears right up. no missing, no shaking, just sweet smoothness. however, my delayed acceleration seems much more likely when driving without the MAF. ive tryed cleaning the MAF, no luck. i know unpluging her sends the truck into a different computer mode. anyone think i should replace the MAF? i may pull one from a junkyard tomorrow. thoughts? and thanks