Possibly You have an "Iffy" Connection in the Eng' Control Circuitry that gets 

jostled by a Vibration that happens only @ 33-34k RPM ~

        In Your 1st post You said > 

"engine started to hiccup only at 3300-3400 rpm in 3rd and 4 th gear"

        So does this Not happen in 1st, 2nd or N ~

On 30 Aug , 2017, at 3:40 AM, Dennis Jowell wrote:

> That's what I was  thinking
> 
> Dennis Jowell
> Scotch Hollow Farm
> Newbury, Vermont 
> 
> 
>> On Aug 29, 2017, at 11:45 PM, OlRivrRat <OlRivrRat@comcast.net> wrote:
>> 
>>> On 29 Aug , 2017, at 4:37 PM, Dennis Jowell wrote:
>>> 
>>> light tan in color
>> 
>>   In My experience that means DangNearPerfect ~
>> 
>>                   ORR ~ DeanB
>>