Vehicle jerks and engine light comes on. Vehicle loses its speed to 20mph?

2007 ISUZU D-MAX
89,570 MILES
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CHANDARBINAYPHAL
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While driving the vehicle gives a jerk (esp. when gear transmission is made) and engine indicator light comes on.The vehicle at same loses its speed to 20mph and the sound of engine is total different. The mechanic at Isuzu dealer has replaced the fuel rail pressure sensor and fuel rail regulator which cost me huge money. But even with these replaced parts, the vehicle was for few days and same problem started to happen again.
Aug 22, 2012 at 2:11 AM
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ASEMASTER6371
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start with basics. check plugs, wires and coil. when was the last time they were serviced??

Roy
Aug 22, 2012 at 2:36 AM
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CHANDARBINAYPHAL
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The vehicle was serviced when the parts was replaced..which is like a 3 weeks now...Fuel tank was also checked and fuel filter replaced.
Aug 22, 2012 at 2:44 AM
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ASEMASTER6371
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were the plugs and all changed at that time?? what is the code??

Roy
Aug 22, 2012 at 2:48 AM
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CHANDARBINAYPHAL
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Yes...Codes are P0087, P1094 and P0093
Aug 22, 2012 at 2:55 AM