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 RPM stumbling/engine dying ???

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MildBill



Posts : 17
Join date : 2018-05-10
Location : Murray Ky

PostSubject: RPM stumbling/engine dying ???   Sat Aug 04, 2018 7:17 pm

91 roadmaster 5.0. When I start it the RPM's king of stumble for a few seconds and then smooth out and idles fine. Go down the road and come to a stop and the RPM's again stumble and she dies? I cleaned the ground at the thermostat as told by Fred. Still having the same issue. Any help/input would be great.
Thanks
MildBill
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Fred Kiehl

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Posts : 4952
Join date : 2009-11-13
Age : 70
Location : Largo, FL 33774

PostSubject: Re: RPM stumbling/engine dying ???   Sat Aug 04, 2018 7:27 pm

My first guess is to look at the fuel pump. The hose from the pump to the output line may be cracked. Another possibility is the pressure regulator in the TBI. It might even be a partially clogged cat. Tihese cars are getting old, and the long term replacement items are starting to show up. How many miles are on it?
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convert2diesel



Posts : 937
Join date : 2009-01-05
Age : 66
Location : Manotick, Ontario

PostSubject: Re: RPM stumbling/engine dying ???   Sat Aug 04, 2018 10:12 pm

Idle control motor and air passage in throttle body.

Bill
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Fred Kiehl

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Posts : 4952
Join date : 2009-11-13
Age : 70
Location : Largo, FL 33774

PostSubject: Re: RPM stumbling/engine dying ???   Sat Aug 04, 2018 10:17 pm

There are a couple of other things to look at too. PCV passage in the TBI, and check for operation of the PCV valve itself. Vacuum leaks anywhere...the hoses are getting brittle.
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