90 Volvo 240 with 282,000 miles, standard trans, mostly original (proudly replaced original clutch at 278,892), misses slightly around the 2500 rpm range in all gears. It hasn't affected mpg and the miss isn't severe but irritatingly noticeable. I'm not sure if it's related but when I'm low on gas it is hard to start. As soon as I fill up - it's back to normal. I've run Techron through it, replaced the fuel filter, plugs rotor and cap replaced, new air filter, cleaned intake. Someone said crank angle sensor(?). Any ideas would be appreciated?