Leaking my heater matrix is leaking and now my punto cuts out wen im driveing it i have to wait about 20 mins before it starts again whys that then ?

What is the code? could be crankshaft sensor.

Someone will need to check it over when it fails to start. You need to know if it is not getting fuel to the injectors or spark to the plugs.

I have a 98 punto sporting nd today it started running like it was misfiring but wen i accelerate slow its fine but wen u accelerate as normal it spits and splutters :'( any suggestions??i have change fuel filter nd injectors ????

Check behind the distributor cap and see if the cam cover seal is leaking. When that seal leaks the car will drive fine til engine heats up the oil and it starts fouling out the distributor cap and rotor. When it cools down the oil hardens again and car run fine. I would start by looking there.

I HAD SAME PROBLEM, ENDED BEING CRANK SENSOR GETTING WEAK, AFTER HOT THE CRANKING SIGNAL IS TO WEAK TO TRIGGER FIRING.

if the smoke smells sweet your heater core is leaking is the water level going down if it is replace heater core

Go to these to sites for manual & diagram good luck
Download PDF search | PDFTown.com
RealOEM.com Diagram Selection

Check the ignition coil or coil packs. It sounds like overheating coil(s)

I had the same problem. Turns out,( and I didn't believe it when I was told) but, my problem turned out to be cheap (inferiour) plugs and wired. I was reccomended to use NKG plugs and Borg-Warner wires.

HE IS JUST NOT KNOWLEDGABLE IN DIAGNOSTICS. DO NOT CHANGE PCM UNTIL VERIFIED DEFECTIVE