Car keeps stalling on my 1991 mazda 626?

need @ things seem escape being looked @ many cars. seems advent of computer controlled ignition systems many owners , mechanics not doing simple things. while many drivers remember replace spark plugs, forget distributor cap (along rotor), spark plug wires , fuel filters. fuel filters replaced more ignition parts.
if have not replaced spark plug wires , cap (with rotor) may problem is. failure of these items not show check engine code on these engines.
if can rule these 2 things out, idle air control or throttle position indicator. while have fixed throttle position indicator self, not person attempt unless willing have replace it. if points inside of not completing circuit indicate idle, engine control unit not enter idle routine in program. switch has points in indicate idle, other idle , full throttle. if idle circuit complete, engine enters idle mode. if full throttle circuit complete goes full throttle mode. if neither circuit complete in normal mode. 1 of points moves , actuating cam fails have enough travel complete idle circuit. bend arm of fixed point insure circuit complete.
vacuum leaks on hoses also.

i got car 91 mazda 626 has 4 cly motor , 145,000 miles never had problem @ every stop light try shake stall.no engine light come .what be.

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