Hello all, i jumped in my landy to head to the store and noticed a ticking noise when accelerating, i turned around and parked it, it then became increasingly hard to start and then would not start at all. i replaced the coil, new electronic distributer,wires and plugs, i am getting spark and fuel but the compression dropped to 45 in 1 and 2 cylinder and 30 in 3and 4 cylinder, it was running absolutely perfect before this, what could have happend ? stuck valves maybe?