last night I installed an aftermarket intake kit on my 94 4runner with a 3.0. it is a k&n filter that attaches to the MAF and a tube that connects the MAF to the intake junction. when I had the intake off I cleaned inside the throttle body w/carb cleaner. it runs fine however when I let off the throttle the tach goes instantly to zero and the check eng. light flashes. the eng is still running. the idle seems high when I first start it. I think it could be the throttle pos. sensor or maybe I tweeked something in the MAF when changing the tubes any ideas?

 

There's a connector that goes to the MAF. Make sure that is secure and free of dirt.
Sounds to me like there's no signal telling the computer how much air comes in.

 

possibly the connector to the AFM, or maybe one of those to the igniter got bumped, but it sounds more like the intake isn't sealing well between the throttle body and AFM

 

plug the afm in

 

Make sure the intake is well connected/sealed, I had the same problem when mine fell off, too much air dont work.

 

thanks to everyone for the advice. turns out I inadvertantly damaged the connector at the MAF when I unplugged it. that sucked! cost me $225.00 for a rebuilt one. installed it and no more problems. the only thing is that it seems to idle high(1000 rpm) after it warms up.eventually it goes down to around 700-800 rpm. it just seems to take awhile to come down. I don't know it has anything to do with the intake or not. any thoughts would be appreciated.

 

mine does that too. i have a cold air intake. just the way it works i guess. but i also live in phoenix where it is currently 103 degrees.............. ugh already... mine has done that just as long as it does go down you should be fine.

 

What they said, check the AFM connection.

 

i know that those after market cold air intakes suck on cold mornings....