Re: 85 2m4 engine problem

On Wed, 18 Jul 2007 18:34:27 -0700, "Les Benn" <lesbenn@[EMAIL PROTECTED]
>
wrote:

>
>"Hank" <hank@[EMAIL PROTECTED]
> wrote in message 
>news:4k0t93h80rr0e094evaooki4rndsonkcgf@[EMAIL PROTECTED]
>> On Wed, 18 Jul 2007 07:51:32 -0700, "Les Benn" <lesbenn@[EMAIL PROTECTED]
>
>> wrote:
>>
>>>
>>>"Hank" <hank@[EMAIL PROTECTED]
> wrote in message
>>>news:n3pq93hv7hq2gedg14iqjbl0nus39m48j8@[EMAIL PROTECTED]
>>>> On Tue, 17 Jul 2007 09:03:24 -0700, "Les Benn" <lesbenn@[EMAIL PROTECTED]
>
>>>> wrote:
>>>>
>>>>>
>>>>>"Hank" <hank@[EMAIL PROTECTED]
> wrote in message
>>>>>news:m73o93p8jb7nc7nnq2ujifclflhqb59idd@[EMAIL PROTECTED]
>>>>>> 85 2m4 180K miles runs good cold after it warms up it looses power
on
>>>>>> low rpms. The car when i say it looses power it like stumbles or
bucks
>>>>>> mainly noticable uhen the rpm's are low like running on the highway
>>>>>> climbing a hill at 60 65 mph it will buck if I down shift to 4th
>>>>>> getting rpms up it will climb the hill easier Also when I am first
>>>>>> getting onto the highway it will start to buck if I try to
accelerate
>>>>>> to quickly.
>>>>>>
>>>>>> I replaced the O2 sensor as it had a code and I replaced the plugs,
>>>>>> cap & rotor and one plug wire as it was 18K ohms the rest are
around
>>>>>> 2K. swaped the MAP sensor and replaced the TPS as well.
>>>>>> I replaced some of the more older looking airline tubes as well.
>>>>>> There are no codes at this point.
>>>>>> Any help would be great as its driving me crazy.
>>>>>> Hank
>>>>>Hank have you changed the fuel filter?
>>>>>
>>>> Yes fuel filter replaced and checked EGR as well ran it tonight it
>>>> runs good when cold but as soon as it get near operating temperature
>>>> it runs crapy again ??
>>>> Thanks
>>>> Hank
>>>Is it just at operating temp or when you are driving down the road and
it
>>>reaches operating temp? What about a vacuum leak? Have you done any
checks
>>>to see if you have cracked vacuum lines?
>>>
>> Yes runs fine at cold which only lasts a few minutes.
>> At operating temp it runs crappy.
>> I replaced a couple of vacuum lines that did not look good.
>> I do not have a vacuum gage its missing I will pick one up but never
>> really used it so not sure what to look for.
>> Hank
>A good vacuum gauge is soapy water look for bubbles 
>
I put a vacuum gage on it tonight the vacuum presure held stable just
like the book said I also checked the coolent sensor the resistance at
cold and at hot measures fine like the repair guide says. Still no
stored codes in the ECM.