Isuzu Repair: bad driving until warm up, isuzu rodeo ls, fuel pressure regulator

Question
I have 2000 isuzu rodeo ls 4x4 .It starts and everything runs ok until the engine temp gauge needle starts moving(4-5min after start up) when the engine starts to hesitate,misfire,low and rough idle and all of these will disapear when the engine gets to normal operating temp and everything runs ok(it takes about 3-5 min).I had to replace intake manifold gasket,fuel pump and fuel pressure regulator,pcv valve for different problems.Also o2 sensors are replaced and catalitic converstors as well(previous owner replaced them).Any ideea to look for?Thnks,daniel

Answer
Hello how are you. Well I would look at a faulty p.c.m. Loose main wiring harness ground, and or bad gas/ incorrectly gapped spark plugs. If the motor feels like it's wheezing, then you have faulty emission system componants. Have you checked your egr valve and a power balance test yet?