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Discussion Starter #1 (Edited)
Thanks for taking time to read this.

My 1965 Series 2A is running very rough. It also looses a small bit of power under load. It seems to have a big flat spot when I put my foot on the throttle put appears to run ok at higher revs.

This have started when I had it parked up for about 4 weeks.

I have already done the following:

Tried 2 different coils
New spark plugs and leads
New distributor (Including points and condenser)
New Carburetor kit (Zenith) as well as tried a carburetor from another LR
New manifold gasket
Adjusted valve clearances
Clean fuel filter bowl (Manual fuel pump)
Adjusted the timing
Tune carburetor with a color tune tool (Can't quite get bunsen blue color 100%)
Replaced fuel in tank
Yelled at it "Run stead ya bastard"
Never ever swore at it.

Any ideas will be greatly appreciated Thanks!
 

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Which cylinder is low on/loosing power, or is it random?
 

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What are you using as fuel? Have you had the heads modified for unleaded petrol? You could have a burned valve/worn valve seat. I.ve seen that cause the symptoms you are describing before.
 

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Discussion Starter #4
I am using 91 fuel + additive.

Did a compression test tonight, Results : 80 ,0 , 0 77.5 dry and 87.5, 0, 0, 85 wet.

I plan to take the head of in next few days. Sounds like valves not seating?
 

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Zero compression on a cylinder would certainly cause rough running.
If it started suddenly after sitting it's probably stuck valves.
 
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