Bucking and surging

Try putting your stock intake tube in with the screen and see if it goes away. Sometimes the 90 deg before the MAF gives the ECU bad readings.

My car bucks at low rpm's (like 1K RPM) driving at a constant speed. The bucking is from my timing adjuster set at 15 deg. It goes away when I set the timing back to 10 deg.

i had this exact problem and what i did was change the fuel pump, the fuel filter... and i was fixed.. YAY i had a lack of fuel causing the engine to go putt putt... but its fixed now due to those two things