Hard to start and when does start idles rough and stalls
Sounds like a big vacume or intake leak. 1st check your intake tube make sure it has no splits also look under the tube with a mirror. Check clamps. Another possible is fuel flow & pressure. There is a couple of places to start.
SOURCE: COLD START ROUGH IDLE
I hate to be the barer of bad news, but may be the head gasket.
My car started with rough idle. Then very hard to start in cold weather. Next started overheating, but no output from heater. Trickling sound from behind dash board. Overflow bottle overflowing.......
I replaced the water pump, radiator cap, thermostat, coolant, fan belts, power flushed the system. Nothing worked. Some research gave me the answer.
The head gasket leak was allowing exhaust gases to enter the cooling system, displacing the coolant. After use, as engine cools, coolant is sucked back into the system and coolant seeps into the cylinder. This gets worse over time.
First thing you'll notice is the rough idle as the spark plug burns off the coolant in the cylinder. (This is especially true at low temperatures.) If it is the head gasket, the other symptoms will follow as time goes by.
SOURCE: MY 96 Nissan Maxima has rough idle and is blowning
blown head gasket. black smoke means that oil is getting into the cylinder.
SOURCE: 2004 xterra P0505 code-idle air control
IAC valve has gone bad. Its located on the throttle body and is what controlls/keeps the vehicle running at idle.
SOURCE: 1995 Nissan Maxima idle problems
Let's try the cheapest fix first. Change the fuel filter out. You'll probably see a brown looking goop in the gas, This is an "ETHANOL" problem. Read up on it. These are all related to so many idle and acceleration problems. Buy a can of SEAFOAM at the parts house. Fill up tank with Premium and add SEAFOAM. Then change filter out before 500 more miles. This should clean out the water and the goop and the carbon build up caused by the ETHANOL. Add a can of SEAFOAM every 3000 mile after that to a full tank of gas. It will keep your emissions,engine, and fuel lines clean. And will keep your car from line freeze up. Good luck.
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