Car has been sitting for over a year, and i recently put it back on the road. At idle it used to read ~800 rpms, now it's at around 1500. Interstate driving w/ 2.77 gears @60mph, I got about 2k rpms, and now i'm almost at about 3500. It usually redlines at moderate acceleration.

I imagine a tune-up is in order-- plugs, oil, air... but should I invest in a transmission flush? I fear a bad radiator may have leaked coolant in the lines.

i'm getting my baby ready to be sold, and want to send her off in good condition. thanks.

 

All too common, mine did the same thing. Fixed it with this thread. Instead of soldering in the proper resister solder in a variable resister with a range that encompasses the proper value for the known blown resister. That way you can calibrate your tach to a computer/scanner reading with the turn of a dial.

https://www.thirdgen.org/forums/elec...fix+tachometer