every time the car starts it idles low and attempts to stall, goes away shortly after it runs
What is your question?
Everytime I go to start the car, it starts at very low idle rpm, around 500 then bounces just above that then back down until I start to drive the it. Then the rpm's mellow out at around 1000, how ever when slowing down the rpms like to stick at around 1500 for a couple seconds. Not sure what the problem could be. I recently found out it didn't have a thermostat in, so I put one in then the car started to overheat, i took it out but it did manage to overheat a couple times. I did a coolant flush, and tried to pressurize the system only to find out one of my freeze plug were practically out. i put it back in and the car stopped overheating without the thermostat in. I haven't put it back in, due to the rpm issue and fear of making it worse due to more overheating.
What makes this problem better or worse?
rpms return to basically normal after it gets going.
How long has your 2000 Ford Mustang had this problem?
a few days, however coolant issue laster a week and a half
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Hello,
I think the overheating is at play here.
Check the oil for coolant and check the coolant for oil.
If there are no obvious signs of mixing in either, use a combustion gas test kit to identify if there is combustion gas in the coolant (head gasket, block, or head)
so I've checked the coolant and the oil, there is no mixing going on since there is no weird build up. I'm not seeing water in my oil either, the car isn't overheating anymore the only issue I'm having is the low rmp at startup and then it attempts to stall until I actually start driving.
Perform an overnight fuel pressure test to verify that you have sufficient fuel pressure at cold start.
A frequently occurring issue is fuel pressure regulator failure with which allows fuel pressure to drop to zero when the engine is shut down for extended periods such as overnight or while the truck is parked while you're at work.
Try this: at first start up, turn the key to run but do not crank. This will pressurize the fuel system. Turn the key on and then wait until all the dash lamps stop flashing, and then crank it to start. If it starts and runs normally through warm up transition, a faulty fuel pressure regulator is at fault, but it is better to install a fuel pressure test gauge to, "See", the fuel pressure value.
If normal fuel pressure is present, visually check for a failed vacuum circuit. Is the, "Service engine soon", lamp on?
so I've checked the coolant and the oil, there is no mixing going on since there is no weird build up. I'm not seeing water in my oil either, the car isn't overheating anymore the only issue I'm having is the low rmp at startup and then it attempts to stall until I actually start driving.
Perform an overnight fuel pressure test to verify that you have sufficient fuel pressure at cold start. A frequently occurring issue is fuel pressure regulator failure with which allows fuel pressure to drop to zero when the engine is shut down for extended periods such as overnight or while the truck is parked while you're at work. Try this: at first start up, turn the key to run but do not crank. This will pressurize the fuel system. Turn the key on and then wait until all the dash lamps stop flashing, and then crank it to start. If it starts and runs normally through warm up transition, a faulty fuel pressure regulator is at fault, but it is better to install a fuel pressure test gauge to, "See", the fuel pressure value. If normal fuel pressure is present, visually check for a failed vacuum circuit. Is the, "Service engine soon", lamp on?