inwells rt9292usa

i installed this alarm for 3 yrs, but half yr ago, sth wrong happened when i tried to remote start my car. it still can start my car, but after like 10 sec starting, the engine will shut down suddenly n then it will restart the engine again n the same situation keep happening, which is just keep grinding the ignition but still can't start my engine properly. n finally the only thing i can do is stopping it n restart the engine using my car key in order to not grind the ignition. does anyone know wht wrong or why this happens? any solutions? if possible, does anyone has this alarm's manual book (I lost mine) ? i would like to refer it to c if i can find out the problem n fix it... Thanks!

It is your tach signal which has lost its setting and you would need to learn the tach signal again.This usually happens if the battery terminal is disconnected or battery is dead.

yea, about half yr ago, i changed my factory battery to a lead-acid battery. i guess this problem may occur after i changed the battery.n also u ar rite, i lost the tach signal b4 n i even changed a new battery tach(+) since there was too much white powdery corrosion products screwed up the terminal. but everything should be fine now. can u explain in detail how i can exactly solve this situation? Thanks!