Problem has me stumped. need thoughts.

[Tasketo]

When i start my car is stumbles and studders, until i stomp the gas peddal repetedly several times. The whole time the car runs like trash. After stomping the pedal a few times the rpm's will rise on their own, and like magic the car runs like new. Once the car begins to run great i can drive for hours and hours, as long as i never kill the car. Once i kill it i have to go through the same process of it runnin like trash. But once it starts running good i have no problems. I have replaced the opti, replaced coil, TPS, plugs & wires, MAF. Car is a 1994 formula auto. got 122,000 on the odo, any thoughts on the prob would be greatly appreciated.

[myersfw]

You might want to have a look at your fuel pressure on start up...

[Tasketo]

Think it could be the pcm/ecu? same thing? right? :dontknow: Just being wierd and then straightening out?

[CKJ]

What kind of opti did you put on, and about how long did you put it on?

[NoN2O]

Idle Air Control, mounted to the bottom of the throttle body. Sometimes they get gunked up show these symptoms.

Just a guess.

[Tasketo]

I Put on a MSD Pro billet, and did it about 4.. or 5 months ago.

[03slowZ06]

Here we can solve this very quickly. Just answer these 2 questions. Does it stumble and studder on start even when warm? Does it smoke alittle on startup? If you say yes to these 2 questions try this. Floor the gas peddal before you start it next time. Just a quick to the floor then let off. If this helps then you my friend have leaky injectors. Oh ya fuel pressure will bleed off real fast to.

[shoebox]

As 96slow6 suggested, leaky injectors sound like a good thing to check. Also check the vacuum hose to the fuel pressure regulator for any sign of fuel or fuel smell. If there is any, replace the regulator.