Runing Problem Help

[maddwrenches]

THe car is a 90 GSX, heres the story engine is a JDM just installed and has been running great, we bought a autometer tach, went for the install, pulled out the ecm and spliced in the signal wire for the tach which was pin109 on the big plug(crank angle sensor), this is what I read was the right wire, goto start it , runs on 2 cylinders for about 5-10secs. and then the car dies, we unhooked the tach ,andwe were unplugging the battery by the way while meesing with ecm, anyways unplugged the tach and hooked everything back up and the car was running fine for about a week, then we drove it to the store was running fine ,turned it off, came back out to leave and the same thing again, never had the problem before we attempted to hook up the tach, anyone seen a dsm do this before cause we are stumped ?Please help!!!!!

 

[Spln_Hrd]

did you solder your connections?

its somewhere in the wiring.

 

[maddwrenches]

yes we soldered the connection but when we went to start it, the ecm did not like it cause the car would run on like 2 cylinders for 5 seconds then just shut its self off and you would hear the ecm click when it would shut off, is this limp mode? Well after that I took the signal wire out and reconnected it,started right up after that, drove around for 2 weeks then all of the sudden same thing again , I rechecked the wire and it has a fine connection. For one Iwant to know if that was the right wire cause I read that several times on this site, and a local forum here for dsmers claim that i used the wrong wire and should of hooked somewhere in the coil, any suggestions pepps DSM is down HELP!!