It starts to chugg or skip when driving at a consistant speed.. on 1999 Buick Riviera

The tranny is not slipping if you speed up it goes away??

Asked by for the 1999 Buick Riviera
Have it scanned, sounds like misfire! Light on?
No lights on
Scanner will show the problem, even without light on. A scanner, not a parts store code reader!
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1 more answer , 3 more comments
agree with pushrod or lock up solenoid malfunction
Could it be the coils??
could be any part of the ignition system
No luck with the buick dealer!? Jus t $$ it seems to only do it in top gear at 35 or 70 time to give up on this one?