Yes an ignition switch can cause it....I had a buick in the shop just last week that would die after 15 or 20 mins of driving....the switch had a burned spot that you could easily see where the wires entered the switch..... a good sign of high electrical resistance and reduced available voltage.....so you might want to remove your steering column covers and look for any brownish discoloration on the wires at the back of your ignition switch.

 

Not sure if this applies to early 2 gen, but here's what happened to me once. I am the original owner a 1990 RX7 GXL. A few thousand miles after I purchased the 90 GXL, the car began to intermittantly shutdown while driving. Just like yours, mine would quit while driving 65-70 mph down the interstate. Took it back to the dealer to have it fixed under warranty. After a couple weeks of troubleshooting, the dealer found the AFM to be defective. The problem never reoccured after they replaced the AFM.

Hot_Dog
90 RX7 GXL

 

awsome thanxs ill try that it s kinda like the MAF in newer cars .... thanxs for looking out man lates

 

im thinking really shady wiring hahaha...

fuel would ahve sputtered and slowly killed and went back on and off... wiring could cut off power to alot of things.

 

dammit well check it out i got a new throttle body and i cleaned and adjusted the fast idle cam and its idleing fine man 500-750 sometimes surging but yea man i still get that lates