2001 Nissan Altima intermittant cuugging at idle

check engine light on or are there any codes?

The check engine light has came on but doesn't say on, took to Autozone and they come up with a code 4 which they say it has something to do with cyclinder 4, thanks for you help.

is it a p0304? If so, then you have a cyl 4 misfire.

Yes that's correct p0304 and the guy said it was a misfire in cyl 4, what is the next step ?

Now you have to see why it is misfiring. Since you said you already did plugs, wires, cap and rotor then you have something else. Either bad fuel inj., bad compression on that one cyl., or possible you have some air leakage from a bad intake gasket. This is where it gets hard, because you need a scanner, a noid light, inj. tester, and compression gauge to see why it is misfiring.

Looks like I'll have to take it to dealer or find a good mechanic in my area because I don't have access to any test equipment like that, the one thing that confuses me is that if it had low conpression or a bad gasket I would think the problem would be constant and not intremittant because the car seems to run good until it goes to idle such as stopping at a traffic light when you first stop the motor runs ok then within 10 sec. or so it'll start to chugg then after a few more sec. it'll run good again and so on until you step on the gas pedal at which time it runs good.

If it is intermittent then it is definently not a compression issue. If you notice it more at idle then I would almost think it would be a bad intake gasket. Honestly, I'm just guessing though.

OK thanks for you advice I'll check it it out and get back with what I find.

This message is for stevew84... took the car to Nissan and they said the same as you a bad intake gasket so I had them change it and the car runs great..thank you.