96 Jaguar XJ6 starts fine, idles at 800 in neutral 700 in gear, at times it gets a bit rough and stalls sometimes, restarts right away with no issues. Will not rev over 2700 rpm in neutral it just bogs. In drive it accelerates with light throttle but stumbles and back fires with more throttle. Stalled once at speed at full throttle and it appeared to have smoke and raw fuel out the tail pipes, then it restarted fine and drove normal with light throttle. It also stalls on tip in after stopping. have had codes for miss fire on cyl X (random), trans did not receive engine speed signal. So far I have cleaned throttle body, removed cleaned and tested the idle air valve, cleaned and tested the TPS (via resistance not voltage) removed and inspected the spark plugs, cleaned injectors (shop did the professional procedure), replaced the fuel filter, checked for vacuum leaks, cleaned the crank position sensor and inspected (not much to see), checked the coils at night for light show, new air cleaner, cleaned the EGR valve then blocked it off for testing no change. Considering new fuel pump, new crank position sensor, new throttle position sensor. car has 140K on it and I'm not going to give up. These parts are not cheap so I have been working from least exp to most, with no change thus far.