Have you checked the coolant level? Sounds like it is low and that this is shifting the ECM into the fail safe cooling mode. Good luck! 
4.6 problem
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New User
Joined: Jan 2006
Posts: 6
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From: Brandon, FL
4.6 problem
Drivin down the road the temp gauge goes from normal to pegged then the oil temp light come on. Then the 
check engine light come on. Then my engine will slow down and start puttering. I turn off the engine and turn it back on and everything goes back to normal.The code I get is p1299 (coolant temp sensor). I replaced it and nothing new. I took the positive cable off the battery for 15 minutes. That help out for a bit driving 30 miles before it happen again. I did find oil on 1 of my spark plug but not much. Please steer me into the right direction.
check engine light come on. Then my engine will slow down and start puttering. I turn off the engine and turn it back on and everything goes back to normal.The code I get is p1299 (coolant temp sensor). I replaced it and nothing new. I took the positive cable off the battery for 15 minutes. That help out for a bit driving 30 miles before it happen again. I did find oil on 1 of my spark plug but not much. Please steer me into the right direction.
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New User
Joined: Jan 2006
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From: Brandon, FL
It is a 1997 with 45000 on it. It is not over heating. It is acting like a air tube is off. The code I get is a p1299 but the discription is a manufacted controlled fuel and air metering. That is telling me it is something to do with my EGR valve.
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Joined: Oct 2005
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From: Louisville, Kentucky
P1299 = Cylinder Head Temperature Sensor Detected Engine Overheating Condition.
Coolant level? Air pocket?
Coolant level? Air pocket?
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New User
Joined: Jan 2006
Posts: 6
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From: Brandon, FL
I made sure all of the air tubes were on tight on Tues. Ran like a champ yesterday (105 miles). Then today I got about 2 miles away from my house and it started the same thing. I have replaced the coolant tempature sensor already, changed the oil, made sure I had enough coolant. Today after breaking down I took the EGR Valve Pressure Sensor off and I had 30% blockage from corrosion. I cleaned all of the corrosion out. Do yall think this will fix the problem?
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