When i go into the second turbo every so often i will get flat spots but they seem to be completely random. Sometimes i wont get any but then other times i may gey get 3 or 4. The car will be pulling great then for a few hundred RPM it will hit a flat spot then it will start pulling great again.

Its the fact that it doesn't happen all the time thats confusing me. I have tried changing the spark plugs but with no luck. Would it be the HT leads?

any help would be much appreciated