eating gas rough idle missing when cold

[rottonrattt]

I have a 95 3000gt 6g72 non turbo dohc i had the motor replaced three weeks ago water pump,timing belt ,plugs,wires,ecu temp gauge ,coils,top vacuum lines excluding purge container lines, plenum gasket,stepper motor.also took to a shop for a standard diagnostic and they could not find any flaw in the running condition.but i have a slightly rough idle with no lights also when start it when cold it goes to 2500rpms for about 2 minutes before coming down to around 1000rp-800 rpms its a steady idle speed with a sputter .also if driven while cold it act's like it doesn't want to really go almost like it wants to stall or something without doing so!but when hot drive fine little power loss if any just the funny idle!please help!!thax in advance

[toddrs93]

Originally Posted by rottonrattt

I have a 95 3000gt 6g72 non turbo dohc i had the motor replaced three weeks ago water pump,timing belt ,plugs,wires,ecu temp gauge ,coils,top vacuum lines excluding purge container lines, plenum gasket,stepper motor.also took to a shop for a standard diagnostic and they could not find any flaw in the running condition.but i have a slightly rough idle with no lights also when start it when cold it goes to 2500rpms for about 2 minutes before coming down to around 1000rp-800 rpms its a steady idle speed with a sputter .also if driven while cold it act's like it doesn't want to really go almost like it wants to stall or something without doing so!but when hot drive fine little power loss if any just the funny idle!please help!!thax in advance

maybe coolant temp sensor or idle speed motor, do you know if this is a california emissions spec vehicle? If so it will have extra pre-catalytic converters after the exhaust manifolds that sometimes cause problems. Honestly I have had several like that and sometimes its nearly impossible to find the problem, if it runs ok as soon as it warms up just let it run a few minutes before you drive it.

[rottonrattt]

i pulled the cam cover off lined up the marks and the lowwer pully is on 10 is that correct?

[rottonrattt]

1995 3000gt i pulled of the cam cover and put my car in reverse and lined up the marks and the harmonic balancer was at 10 is this correct timming?

[Stealthee]

That 10 is for ignition timing. That has nothing to do with cam timing.

Again, please stop making multiple threads. Keep all the info in the one merged thread.

[hollydolly]

Mine started idle reving when im stopped it will rev 1-3rpm continusly by itself.any ideas as to a cause

[hollydolly]

Originally Posted by hollydolly

Mine started idle reving when im stopped it will rev 1-3rpm continusly by itself.any ideas as to a cause

bought a can of mass flow cleaner got home and reading the back of the can it says don't use it on Karman Vortex mass air flow sensors. the examples listed include mitisubushi. So does my car have the Karman Vortex mass air flow sensor? how do I tell?

[Stealthee]

Yes the 3000GT uses a Karman MAS