Yes, several chips for 1995 Nissan pickups are available. Try searching on ebay, google, or other online stores for chips that match your make, model, and year.
it depends, they have to be both the same type of rx-7. cant be using a second gen computer and converting to a third gen.has to be same engine (if turbo u have to get a computer out of a turbo rx-7),everything has to be the same make engine wise. and if manual then it has to have a manual computer like u stated. only if the 93 and 94 are of the same generation RX7. I belive they are both of the 2nd gen... but not sure... this is a great site for 7 owners... www.rxforyour7.com 93-95 are all thrid gens, I myself am not sure it it will work, I dont think this is a good site to ask questions. Go to www.rx7club.com With the Rx-7's it doesn't matter if they are both Manual, there is alot more to it than that. The ECU's differ vastly in different models and often in different years. The part number has to be identical for them to be interchangable. I tried using a different year once with the second gens and it didn't work. I'm not 100% sure but I don't think that 93 to 94 are interchangable. Your best bet is to call mazda.
Many rough idle problems are the result of burned valves. At a higher speed, the engine may not seem to be running rough, but may still be misfiring. On the other hand, if a valve is only slightly burned the cylinder may actually fire. It can also be a bad sparkplug, wire or distributor cap. In any case, you'll need to find out which cylinder is misfiring. If you've encountered a misfire problem that seems difficult to track down, run a compression test and see if all cylinders are ok. If the compression is up, track down other possible problems.
In the relay box under the hood.