My pontiac will start up fine and shut off when it warms up.the next morning it will start up,idle fine,till it warms up.the only trouble code i got was a p0172 code,will this cause the problem?
P0172 is a rich condition > I dough it would cause it to shut off after it warms up . If real rich , it would cause a no start at all . Fouled spark plugs , you can pull the spark plugs to see if they are black or wet with fuel . Starting and running till warm then shutting off is a classic sign of an electronic component starting to fail . Does it start right back up or do you need to wait till it cools down ? If it doesn't start right back up , pull the two plug wires off the same coil and have someone crank it over . Is there spark ? If not , probably ICM - ignition control module is bad . There are videos on youtube on how to test GM DIS ignition systems . (distributor less ignition systems )
Check for spark when it stalls. GM's 3.8 liter motors are notorious for ignition control modules failing when hot.
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