another 1.9L idle problem

[f150gt]

I know there have been other threads on this topic, but none specific enough to solve my problem, so I am trying another one. I have a 93 Tracer with 1.9L automatic that idles rough and sometimes at intersections when I have to wait for a long light, it really stumbles bad and wants to kill unless I really get on the gas with my other foot on the brake. Here are the things I have replaced already with no improvement so far:

air filter
plugs and wires
pcv valve
idle air control valve
fuel filter
fuel injector cleaner through gas
cleaned throttle plate and maf

I get no check engine light, so I don't think I would be able to get a code if I purchased a code reader, and it goes down the road fine with no sputtering or hesitation. Will be going in to mechanic this week unless I can figure anything out first.

[TenaciousRD]

May sound funny but check the fuel pressure coming from the fuel pump. I replaced mine recently and the idle improved instantly.

[f150gt]

Thanks, problem ended up being a blown intake manifold gasket, which I would have never found. I had local mechanic replace.