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rpms jumpy, low idle?

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well, i got the '86 tagged and on the road (FI 3at EA82) but it's having its share of problems... the first one i couldnt find on the search...

 

the car's just there sitting... i put the key to the ON position... leave it at the ON position, i get a mean buzzing noise from what it seems to be the dash, and the tachometer bounces up and down! Keep in mind this is when the car is NOT running at all... because when it does this, it doesnt even start. i fiddle with the battery terminals, and bam, it starts. then i turn it off, and put them back to where the terminals were before... and it still starts. 20 minutes later, jumpy tach, buzzing, no start. whats up with that?

 

also, when it IS running.. it idles however it wants to (300-1000) and its timed perfectly. i made sure it was timed right with a light and all. sometimes it just stalls out of nowhere, the RPM's go so low at times. not to mention it TICKS horribly when the RPM's are low.. I've added MMO to the oil when I changed it though.

 

so... hopefully someone can help me (esp. with that no start problem)... the Subaru is going to be the "road trip" car so hopefully I can get it tip-top pretty soon...

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