cold running problem

[Soma576@xxxx]

guys,

here is the other problem i have as i mentioned in my previous post. right 
now it is around 15-30 deg F in this part of the country (ND). i just had my 
entire fuel system and engine regulating systems checked and serviced by PJ 
Grady, who did an excellent job on everything. but a problem the was around 
before i had the service is still lurking in my engine somewhere. 

it seems that when i start my car and drive it w/o letting it warm up and the 
ambient temperature is low (15-30), the car will shudder and refuses to 
accelerate past around 3000 RPM, no matter what gear you are in. the RPM 
gauge goes up slowly as you accelerate (the engine feels underpowered when 
this happens) and right at about 3000 RPM the smooth sound of the engine 
breaks up and turns to a rhythmic JUN-JUN-JUN-JUN until you switch gears and 
go to a lower RPM, then when you get up there again, it breaks up again. 
this continues for maybe the first 90 seconds of driving. then it's gone and 
doesn't come back until the start the car again when it is cold. hot or warm 
starts do not result in this problem.

like i said, my entire air meter assembly, fuel system, and lambda system was 
either replaced or fully serviced by Grady last month so i do not believe it 
to be a problem there. i have installed new plugs, wires, cap, rotor, and 
coil , as well as a new lambda sensor. about the only thing that i didn't 
send to Grady or replace was my thermotime switch, which didn't seem to be 
damaged or operating incorrectly, but the symptoms would point to something 
of this sort. also, last summer my entire fuel tank area was replaced, so i 
don't believe it to be a fuel system problem.

any ideas or things to check?
Andy 

Soma576@xxxx
1982 DeLorean DMC-12 VIN#11596
Fargo, ND 58102


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