My 1992 toyota v6 pickup is idle high 1200 1500 rpms just had intake gaskit fixed

check that idle solenoid in the base of the carby is working and connected. This shuts of the idle circuit in the carby and prevents run on when the ignition is turned off

check for a failed cat converter as it may be blocking the exhaust system

TPS sensor and IAC sensor.

Its hard to say what you exactly mean by sputtering , but it could be the throttle body needs cleaning, or you could have an ignition problem in the plugs ,wires, or ignition coils. Also does it have a fuel filter that is changeable that was forgotten about? In other words ,It sounds as if you need a thorough tune up with all the goodies.

could be a spark plug or plug boot, depending on the last time they were replace i would recommend replacing them all.

1992 toyota pickup 4wd V6 3.0L SOHC. The fuel filter is located on the right frame rail underneath the passenger compartment.

It sounds like you may have a vacuum leak. Your car should normally idle at about 700-750 RPM. You said that yours was at about 1000-1500, that is waaay to high. If you have a leak somewhere in the system the car will draw in extra air and it will want to idle much higher and will also be very erratic and hard to drive.

if it is burning rich, there for it will be over fueling around low rpm i do belive, which will cause the engine to flood, im guessing after you have been low rpm then go for high rpms, it like hesitaes and takes abit of a cough then goes, if that is the case then it is overfueling.

there is a way to advance/****** the engine mixture, but id say for safe if you don't know what your doing to take it do a garage, and ask for it to be timed up with the timing strobe light :) which will stop the, over fuelling around low rpms.

Is the check engine light on?

A major cause of surging is either air leaks between the air flow meter and the engine intake manifold, or a bad or mis-adjusted throttle position sensor.

I would guess that you instaled non-Toyota plugs,The OEM plugs are >>>critical<<< to proper performance. As a Toyota Service Manager, I cannot stress that point enough.