Miss at cruise

[gs14racer]

Hey whats up guys

Havent driven the car in about a week, Took it out tonight to give it some use before this drift event im doing on sunday.

Anyways under power the car still flys and runs perfect however it has developed a miss while cruising in low gears at constant speed.

Say 45 mph in 4th or 5th it will give a slight miss or hicup every 5-7 seconds until you, its only at constant speed, if you give it a slight amount of gas it goes away completly.

What do you think it could be?