After you have checked the cables I think you need to check the mixture.
If the pilot screw was adjusted while the bad "intakes" were on you will probably now be running very rich. (I know running lean on mine has the opposite effect to what you are getting).
Warm it up and turn the pilot screw in 1/4 to 1/2 a turn. If the tickover increases you are running rich. If it decreases you are running lean and need to turn it out instead.
Keep adjusting it until you get maximum tickover. (Take care not to turn it out too far - at about 7 turns out it will drop out).
I think stock should be 2 to 2 1/2 turns out.
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