Rossi: Death and taxes - Understanding how 'step-up in basis' works. An IRS building in a file photo. It is often said the only certainties in life are death and taxes. Thanks to estate and inheritance tax, it is not uncommon for them to occur simultaneously.
Probable Causes: An engine that hesitates, stumbles or misfires when accelerating or when it is under load, is an engine that is either sucking too much air, not getting enough fuel, or misfiring. If there are no misfire codes, a common cause of acceleration stumble is a bad throttle position sensor (TPS).
1 Vacuum leak, again like above. 2  Fuel delivery issues, like clogged fuel filter or weak fuel pump will sometimes cause an engine to chug and stall at low speeds.  Base engine issues, like cam/crank timing can really cause erratic behavior at all engine speeds, but again may be more noticeable at a stop.