blackhawk |
01-21-2012 06:23 PM |
78 911 3.0 started running very rough any help??
car is a 1978 911 with a 3.0. no A/C, smog pump removed for now.
the car just started running bad. not sure if it is related to the cold but one night i was driving and it started coughing (backfiring while driving when i would step on gas) then when i pulled off highway onto surface streets it ran very rough, when at idle the RPM's started going up and down from 950 down to about 700 then back up and so on. also i noticed the tach was jumping a bit as i was driving, so i would be at 3,000 rpms then it would start to jump to 3200 or 3300 then back down it did this for a while. just fast jumps. also with a def power loss as well.
one other note, the next day or day after it drove fine but then it went back to running rough. even on a much warmer day. on a cold start it starts right away but the idle is rough hunts up and down and small backfires when i rev it. i have replaced plugs not too long ago, replaced fuel filter, i have a K&N air filter and a MSD ignition with fairly new wires. any thoughts, suggestions or advice would be great. thanks
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