Have you ever adjusted the valves? Are they still adjustable? and what about a vacuum leak at the intake. And the SP2P is a crappy intake. Good thing you have the smallest V8 made.
Yes, I had a slant six, so I have practice adjusting valves, and they're still there on my 273. Adjusted them a few months ago, and it ran better, and got rid of the faint popping from the exhaust at idle.
Agreed – the SP-2P is crappy for performance, but perfect for max fuel economy that I'm after, and it seems to work great with the little AVS2. This car is strictly for cruising and long highway trips with my son. I never even touch the secondaries.
