I have a 1998 4x4 Chevy V6 (a 4.3 I think).
It misses when crusing about 1500 RPM and above, also when
you accelerate. It also loses power if you floor it all the way.
This only happens when:
- After a car wash
- If the weather is humid
- If the weather is below freezing.
- If the temperature changes fast (Morning dew)
- If powder snow go into the engine (-10 C)
Will Not Misfire if:
- The weather is above -10c
- Summer (But lack power in passing gear)
This problem come and goes, it will be ok in the morning
when I go for a short ride, let it rest for 5 minutes or
so. Go and the problem will be there for another 5 to 10
minutes then disappear.
I have code 147 and 300.
I have changed the plugs, Wires, Coil, Air filter and the
Fuel Pump One year ago (it still make a high pitch noise).
Chevy dealers here, just wants my money. They cannot duplicate
the problem and I'm not in there priority list and since I never
got the truck there, well you know. All they say is give me more
money and wait.
Any help would be appreciated..I really don't know what to do.