At startup my 94' F150 will oscillate from high to low idle

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HELP!! White with a hint of blue smoke at start up - TDIClub Forums

https://forums.tdiclub.com/showthread.php?t=422402

Aug 27, 2014 - It burns and results in white/blue smoke on startup, but should ... So the leaked oil burns off after initial startup, but quits smoking after a few minutes. ... to try tomorrow morning. if I remember correctly the smoke at start up just ... yet another white smoke on cold startup - maybe fixed?
Jun 28, 2009
White smoke at start up?
Jan 25, 2000
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I would check the idle air control valve. The computer controls idle speed by regulating the amount of air entering the throttle body by using the valve. It could be sticking or failing.
I am assuming you have a 93 Monte Carlo.

I hope I can help you with your question I believe I can first and foremost if you're having trouble starting your car on cold mornings it's probably going to be a clogged fuel filter or bad fuel pump about to go out you're having symptoms as you described and then whenever you're at 55° things start to warm up and you can start your car okay the filter is so clogged up imagine that look looking like a blood vessel okay when you have a clog in it it doesn't allow the blood to flow freely feel the same way

Without having the year, engine displacement (size), or the manufacturer, I will assume this is a ford 6 or 8 cylinder. I would begin by listening for a high pitched sucking sound (vacuum leak) this is a very common condition on ford products. If none is found I would l probably lean towards the Idle Air Bybass Valve which actually controls the idle speed, they are very prone to carbon buildup and failure. If you would like to send me more specific info on the vehicle, I will be glad to give more specific information to help you out.

Sounds like a cold start valve (which is actually an additional injector in the intake to assist in cold starting) If you can get it to your local prts store while the light is on they will read the codes for free and tell you what the car thinks is amiss.

should idle around 700

Two items to look at: Throttle position sensor, $45-50. PCV valve, $4-5. Either will, at times, produce problems with idling.

this is down to the idle control valve or the sensors on the exhaust being faulty.
please rat this advce.