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ORIGINAL: Jsands

I have started having problems lately when I first start up in the morning.  The truck fires right up and settles into a steady idle then the idle starts dropping and the motors sounds like it is dropping cylinders.  The bad thing is the problem doesn't occur all the time.

Some of the things I have done is changed the TPS, IAC, IAT, ECT sensors, the plugs, and the fuel pump relay. I'm still having the problem and the problem does not cause the check engine light to come.  It almost sounds like it is running lean and it back fires through the intake if I give it any gas.  I haven't been able to check the fuel pressure at the rail when it is stumbling but when it is running fine I'm reading approx. 48 psi, which I believe is good.  It occured today right after I pulled out into traffic.  I don't think San Diego drivers would appreciate me popping the hood in the middle of rush hour.

Also it isn't blowing any black smoke.  The only constant is that it occurs when the the truck first  starts up.  It is a 03 with the 5.9.  I was think it might be the MAP sensor but I'm unsure.  Any help would be appreciated.  Thanks

Sanders