hi i've got a problem my motor starts 1st time but when warm dies but still goes only in slow motion ( lower revs ) i took it to mechanics they told me its gonna costs me a coupLe K he told me cylinder 3 has a comp reading of 45 and no. 1 has 140 no. 2 has 130 and no. 4 125 can you tell me whats the real prolbem and a good price to fix that third cylinder thanx heaps