help me decide, (long but could be helpful)

if i'm going in the right direction on this.
the problem is the famous cold start 30 sec. rough idle.
i have just about replaced every thing to fix it. let's see
the secoundary air pump,with air control valve ( had check engine light), just about all vaccum hoses, both pre cat 02's(also had light), ect sensor (the one for the ecu/also know as a double temp sensor) cam pos. sensor, fuel filter, plugs/coil boots, maf (needed too), had valve cover leak, so put on new gasket, which was done well before the rough idle, new stock air filter. also twice i got po170 codes, which in turn killed my bank 1 sensor 1 02 twice.

so in researching the 0170 code everything pointed to a intake manifold leak. so 2 weekends ago i did a complete intake manifold gasket rebuild. replace both intake gaskets, the air temp sensor gasket, cleaned the air temp sensor itself, clean the intake, beat i could, replace both tb gaskets, and cleaned the tb's. now i must say, this was money right here well spent. i have regain throttle response i didn't even know i had.

but still rough idle on cold start. so now i belive it is a fuel delivery problem. like as in, needin a new fuel pressure regulator. when i start the car, the rpm's go up smoothly to 1200 and smoth back down to 800 rpm, and then rough idles a little. the past couple of days i keep my foot on the gas to keep up between 12-1500 rpm's for a few secs. and it's fine.

so what ya think? new fuel pres. reg.? i'm think on a cold start it use's what fuel is in the rail, and then has to really suck to get gas, or it's losing fuel pressure durring long sits.