had my truck to the garage recently and I'm not sure all is right. Seemed a little off when I got it back but not sure. Hooked up my Scan Gauge II and looked for codes or other problems. Only thing I can't tell is if ignition timing is right. at idle the timing is at approx 22 degrees BTDC. depending on the throttle applied the highest is 33 degrees and the lowest is 18 degrees. I can find everywhere that the timing is not adjustable but does this mean that the distributor was put back in one tooth off? Any help but not guessing is appreciated. - - - Updated - - - sorry, addition to first post. i have yet for the thing to throw a code. at least 3 days running, 8 start cycles if that matters.