SoftwareSerial interrupt conflict?

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hello gurus,
i have timer2 interrupt of 2msec driving entire clock motion control program (multiple stepper motors , multi led display). whole thing synched 50hz mains long term accuracy ds 1302 chip during power out. works fine. when include softwareserial in order add gps module problem arises.
just adding the  .begin creates  unwanted interaction timer interrupt. presume softwareserial involves use of other interrupts. there way around problem?
theres no point posting code yet. few suggestions appreciated.  (ide 1.0)



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