my car sputters after i crank it up. it doesn't do it right away though. i crank the car and let it idle for a little bit then it will start sputtering and act like its about to die, then the idle will go back up. sometimes i start driving it after i crank it up and the car will cut power and start sputtering and then it will stop sputtering and then runs fine. but it only happens after i first crank it up. it does it just about every time i crank it up no matter how long it has been sitting. i have changed my cap, rotor, coil, plug wires, plugs and it still does it. i dont get any check engine lights from it either. any other ideas what may be wrong?
02 sensor maybe? map sennsor?
need help its driving me nuts.
thanks

 

check the voltage on the tps sensor, I had the same problem i believe at closed throttle voltage shoud read .45 and at wot 4.5

 

Do you have an aftermarket manifold?

 

i have stock manifold.
my throttle voltage according to the vafc is:
closed .385-.390 (it fluctuates)
open 4.550-4.560 (fluctuates).

 

any more help?

 

when you first place the key in ignition, turn it where all the lights are on - you should wait a second or 2 before cranking. you should crank it as soon as you place the key in ignition.

 

Check your v-afc connections. Re-solder if necessary. That's what it was for me anyway.

 

I've got something similar in my Rex, I'm thinking a leaky injector in my case.
Mostly because it stumbles when started, and then clears up in a few seconds or so.
No mods on this car. Ed

 

i always prime the fuel pump. very rarely do i just put the key in and start it up right away.
and i had this problem before i put the vafc in, so i dont think that is the problem.
someone suggested that it might be my ignitor.