Hey ppli need help to solve what's the matter with my car.
Symptoms:
I start the car and drive for about 50 yrds and it starts to slow down and also It seems as if there is no accleration there as the car is holding back.

It misfires alot

sometimes I start the engine and leave it running for 10 secs then the revs slow down and the engine cuts out.

Iv tried changing spark plugs, HD leads , distributor cap and rotary arm
with no change at all.
Please cud u give me ideas as to what cud be the problem and how to solve it. Bearing in mind I am not mechanically minded

thanks for your help