it's locking and unlocking fine.. i've checked a million times. i cleaned the MAF sensor and it's been running fine.. i took it on a 200+ mile trip.. the shuddering feeling happened once and didn't last long (which is strange).. it does seem to be more of an issue when the temperature outside is warmer.. next warm day i'll really test it.. so it's running absolutely fine but i doubt it's fixed... so i will re-post soon.