shuddering, missing...i don't know:(
New User
Joined: Jan 2009
Posts: 9
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Check your exhaust. I have a 150 strait 6 and had shudder and it would die going slow . At idle or on the highway it wouldn't die but lacked power. I would have a check engine light on on highway speeds. Ran a check it came back with a few different codes, i.e: egr. o2 bank 1 rich, excessive torque converter slippage, and pcm to fuel pump problem. Turns out my cats where clogged bad and it would not allow the exhaust gas to leave my port and let air and fuel in causing all the problem. Changed the whole exhaust system and no more problems and a whole lotta more power. Hopefully yours is something like this and easy to fix. Good luck
Thread Starter
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Freshman User
Joined: Feb 2009
Posts: 29
Likes: 0
Check your exhaust. I have a 150 strait 6 and had shudder and it would die going slow . At idle or on the highway it wouldn't die but lacked power. I would have a check engine light on on highway speeds. Ran a check it came back with a few different codes, i.e: egr. o2 bank 1 rich, excessive torque converter slippage, and pcm to fuel pump problem. Turns out my cats where clogged bad and it would not allow the exhaust gas to leave my port and let air and fuel in causing all the problem. Changed the whole exhaust system and no more problems and a whole lotta more power. Hopefully yours is something like this and easy to fix. Good luck
. Actually, being about 600 short for repairs, I may be forced to sell The Beast 
but, someday i will have a **** load of money and fix up another Beast
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Freshman User
Joined: Feb 2009
Posts: 29
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sweet! It is a beatiful state!
Senior User
Joined: Nov 2007
Posts: 179
Likes: 0
From: Texas
Since it seems to be only happening at first startup, maybe it is a malfunctioning EGR valve?
Seems I have read some ways to troubleshoot EGR valves here before, but I can't remember...
Seems I have read some ways to troubleshoot EGR valves here before, but I can't remember...
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Joined: May 2007
Posts: 86
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I had the same problem on my 1988 1 ton 7.5/460 after several trips to the dealers and various mechanics and not to mention the $$$ arms & legs, sensors,filters, plugs, etc. it was a bad fuel pressure regulator. Which also helped the fuel mileage.