i managed to get a good trip to minmus and back. something about having fuel lines on the upper stage. which makes no sense i followed Scott Manely and Matt Lowne,s instructions and started it at the fuel tank i wanted to drain from and ended at the tank i wanted to flow to. but once i removed that fuel line it worked fine. now i go to minmus, do all the fun stuff plant the flag and what not, make a nice safe return to kerbin. save the game. shut the computer down to go play a round of golf. i get back 6 hrs later, fire the game up, load the same aircraft that just 6 hrs earlier flew to minmus and back with no issues. made no changes (no need to it flew perfectly last time) go to launch and for whatever reason at 6000 ft mechjeb cuts the throttles on the ascent stage,. so i am back to worse than square one. cause square one it least got to orbit before mechjeb decided to excrements the bed. now i barley get 6000 ft of the ground and mechjeb is like "screw it. let them crash".
have to work the next 4 days but on my next day off i am going to do Brigadier's advise and upload my simple build here for the pro's to look it over,.
12/5 update: after work i did some tests and itis 100% a mechjeb issue. a friend suggested i delete mechjeb and reinstall. i guess now you have to go thru this overwolf bs site now to install mechjeb and make it work. so i did that and it worked fine and dandy. however i have noticed every single time i close the game. when i restart mechjeb i had the exact same issues of mechjeb cutting my thrusters at 6000 ft. what i found out is (at least for me) i have to uninstall mechjeb and then reinstall it every single time i load the game and to top it off you have to lunch the game via overwolf. not sure why the creators of mechjeb decided to go thru this overwolf bullcrap site but it has made using mechjeb harder than it should. then again the developers of mechjeb prolly decide people need to learn to fly the spaceship themselves and stop using mechjeb. so they make it as difficult as possible to use mechjeb now. it is working. after watching scott and matt's videos i managed to get to the mun and back.