Hey guys I have an issue while deceleration I have a slight hiccup or buck. For an example in fourth gear I will be driving at a constant speed at 3k rpms and when I take my foot off the gas and the car is decelerating naturally at a constant rate there will be hiccups or slight bucking w fluctuation of motor pitch similar to a misfire maybe, any ideas guys???

this is a b16a2 head on a b18c1 block

 

As you have given almost no background information, do an ignition system tune up. Then go from there.

 

As you have give almost no background information, do an ignition system tune up. Then go from there.