My 74 2.0L D-Jet seems to be a little "sputtery" in the 2-2.8K RPM range. At 3-4.5K RPM, this car kicks ass (ahem, for a car its size and age anyway). Going up very steep hill Saturday at 60MPH in 4th gear, trying to keep up with a 911 (and failing badly

), I think I heard a few pings. WTF? That's a sound I only ever hear in my wife's ancient Safari when she puts in the cheap gas (now $2.70 in San Diego).
Recently installed Pertronix and reset the timing.
TPS?
Timing?
Need more info?
Thanks.