Fuel pump, fuel lines, injectors...... blockage in your exhaust, dirty sparks, worn HT leads.....
It is such a strange problem with many possible causes. You could probably do with taking it to a good mechanic for a once over.
<span style='color:blue'>"So my BM makes me a flash bastard? Then I guess you're just keeping it real from the seat of your nova?"</span>
<span style='color:gray'>"...and the home of the brave..... is bravey 130bhp from a 7 litre engine? 100bhp/litre or don't bother building it!"</span>
<span style='color:red'>"Aaahh the UK; where every road is jammed, under construction, poorly maintained and unfairly policed, at least we don't get over-taxed for it........ HA HA HA!"</span>