engine issue

[RODEOMAN]

some background, a few weeks ago this has started occuring, I will start up my vehicle, everything is fine, as soon as I am about to shift from 1st gear into second, I get "check engine" light and I loose power, almost like motor goes into limp mode, this only lasts for a few seconds, and I am able to shift and go about driving as usual. another scenario that happened just few days ago, I got the truck started, left it for a moment, and it kind of shut itself on its own, got back in it, started it up no prob whatsoever. all gauges are working fine, I just replaced alternator recently and it is charging as it is suppoused to, battery is an upgraded Orbital battery. I haven't noticed any loose wires, no new noise under the hood. I am very confused on this one, if anyone has anything else to chime in feel free and thanks for any info you can share. BTW could there be a vacuum leak and could it be causing this? also so far this has only happened about 3-4 times within this month
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[CPOM]

What are your trouble codes?

[RODEOMAN]

there isn't any as check engine light is only on for a moment. I did find some info over on toyota boards about MAF causing this and I will clean mine so we shall see. thanks for your reply

[reacharound]

I know on gm trucks with auto trans. a K & N air filter can be your worst enemy if you over oil the darn thing. What happens is the oil off the filter gets on the mass air flow sensor and causes it to not function corectly. and will sent your auto trans into a limp mode. I dont know if it could have the same effect on a manual trans truck or not. but if you are running a K&N filter you might try taking come rubbing alchol and a cotton swab and clean the oil off the the sensor. just my $00.02.

[RODEOMAN]

I will clean it up regardless as I have close to 150k miles on truck, and I don't think that it has been done before. I don't have k&n filter in mine, not to fond of those filters at all. another thing I thought about, there could be some mud in alternator, because it sits so low in Rodeo, will run it through carwash, as to my knowledge if motor ain't getting enough juice it will go into limp mode. thanks for the replys and keep them coming. Adem

[Doc Holiday13]

My YJ would stutter sometime and when i would start it for the first time in the morning it would almost stall out. I ended up having a fuel induction cleaning along with TB cleaning. I also had a bad speed sensor. After all that was done the stutter stopped