i have a 1970 merc 500 50 hp that when i got it 1 week ago run great in neutral and good at idle in gear and great at wot, now it wont go other than at idle in gear or in neutral. ive checked and there is great spark at all 4 great compression (top120 psi,2nd 120 psi,3rd 120psi,4th 122 psi)if i...
