Engine Stuttering Under Acceleration, Then Hard To Start?

Hi all, im in need of a bit of advice, my usually solid 998 in my 1991 city has suddenly started stuttering when i accellerate, but only low down in the rev range, higher up it runs like normal. Also, its now very hard to start, and requires alot of coaxing and choke to sputter into life.

Anyone know whats wrong? So far ive checked: Plugs, all firing
dizzy cap and rotor arm, cleaned
air filter, clean
actual engine, timing right and in good condition

Maybe ignition or fuel? Ive never had an engine problem before! Thanks for any advice.

check the dash pot oil and that the piston moves freely . if your having trouble starting when warm/hot it mat be running rich ,what colour is the exhaust - plugs when you checked them ? black and sooty or white ??????

Dirt in the carb and jet.

Check your advance and retard pipe is connected properly...