huyndai accent 1.5 CSI 96 model 12Valve?

My vehicle suddenly battled to start. It would start a few times in a row, then I would battle to start it. At first I fiddled with the plugs and plug wires when it happened, that helped, and it would start afterwards for a few times again. Then, fiddling with plugwires didn't work anymore, so I fiddled with some of the electrical plugs on the engine. Same thing, would start a few times, but if you let it stall, it wouldn't start. Now for some reason, the vehicle cuts out and the only way to get it started when this happens is to slam the bonnet hard while someone is attempting to get it started. The starter is new, the battery is new, and the alternator is reconned. Please can someone assist.