ok if i leave my car off for awhile i have to pump my gas pedal for it to start to krank and then pump the gas and then it starts what is it i changed the fuel filter and then it still idles rough like a muscle car ive sprayed this can in my intake to maybe clean out my carb to clean it but still the same thing what should i do ? please help

compression test it.

does it have problems starting hot?

what sort of car/engine is it buddy.

2002 mitsubishi diamante ls 3.5L V6 hot no it turns on but the sameway sumtimes pumping gas pedal

Its not carbi then, its EFI.

Check your compression, plugs, fuel pump (see if its noisy or not) and if they are all fine get the injectors cleaned and a service and tune up done.

Its hard to diagnose these sorts of problems with out being there and seeing it, and instead of just having a stab in dark at parts to replace. Its often cheaper to just take it to a mechanic and let them figure out what is wrong and either repair it yourself then or let them finnish it all.

PS: pumping the "gas" on a efi car doesn't effect it, all the "gas" does is open a valve to let air in, the MAF sensor then reads that more air is getting in and fuels for X amount of air. When starting a car the MAF isn't being used, its pretty much 50% duty regardless of throttle position.

do u live in the states

nope, but ive been there and my partents are from there lol

why do you ask?

I'd be pointing towards the fuel injectors

sounds kinda like a fuel delivery problem. You say you've replaced the fuel filter, so as TC said fuel pump is a possibility, as are injectors.

Could even be a bad batch of fuel, or a seriously blocked air filter.............

And I can guarantee that someone will tell you to 'reset the ECU' : aka disconnecting the battery for 10mins.

nope, but ive been there and my partents are from there lol

why do you ask?

coz u higlighted the fact that "gas" pedal..

so ya'll from the states could understand