hi everyone I have 99 suburban. 2 wheel drive, 5.7L. gas,140,000 miles. never had problem with it. changed oil every 3000 miles. here is the story. I stop by a store about 10 min. when i came out car won't start. only hear clicking sound. i checked cable, battery, everything was fine. put new battery, new alternator, new starter nothing works. tested old starter with jump cable and in working order. so i put old starter back and car started. drive it home and restart few times and it work perfectly. second day morning same thing happened again. only hear 1 clicking sound but engine won't crank at all. checked cable and battery, changed spark plug and nothing help. tried hand crank the engine and it is not turning. very hard to turn it with wranch. really don't know what happened to it. is my engine gone? can someone please help?
by the way, no water or oil on spark plug when 8 of them removed. also tried jump start and no luck.
thanks