Recently I pulled out the stock air box intake from my 94 pickup v6 5 speed and put in a brand new k&n air intake but the rpm needle was all over the place. It wasn't able to drive. I changed the mass air flow sensor and can drive now.

However, when shifting the rpm drops more quickly than it usually should. And after a drive (motor still warm) the car starts With normal rpm idle then slowly gets lower and lower till it dies out unless I put it in gear and go and it's fine.

What's the possible problems that are causing this? I don't thing the Ecu needs chipping right?

ALSO ON A COLD START FROM OVERNIGHT THE CAR NEEDS A LITTLE PUSH ON THE GAS PEDAL TO HOLD IT AT A HIGH RPM FOR 3 SECONDS BEFORE UNASSISTED IDLE.

It ran fine besides what's up above before the new intake.

 

I would check for air leaks in your intake, after your afm.

Or possibly your computer needs a reboot?

Try disconnecting your battery for 20 mins...

 

I checked for leaks seems all fine and I rebooted the battery and it ran worse because I guess the system started from scratch again but it seems caught up now but still have the same problem. Any other thoughts?

 

Since it was running well before the intake and you changed the maf..make sure no wires in the connector are broken and get a can of electric connection cleaner. Spray down the pins where the wire connects into the maf...also i had the same cold start issue except mine only happened after attempting to restart the truck after 20 min + drive...turned out to be the fuel filter and then fuel pump...wouldnt hurt to clean the throttle body as well

 

Besides looks the intake isn't gaining you any thing. Maybe on the high side of the rpm band. I'd switch back and just put a factory replacement k&n.