Cars Q&A

Hello All I am proud owner of Daewoo cielo from last week engine get worm like anything only for two to three kilo meters' without AC and not much of load on the car recently I was changed spark plugs and the cables and distribution unit and also changed the AC blower fan unit after that I noticed this problems even I check the coolant cap and coolant level also it all fine CAN anyone tell me the Route cause for this problem or anything to replaced