Miss between 1500rpm and 2000rpm

[dreamshare]

I have a slight miss on my b20b, if I accelerate hard then it goes fine, the problem happens if I am driving slow then the car starts jerking.If I keep the rev constant at 1500rpm the rev counter jumps sligtly up and down.Please help

 

[RonJ]

Any CEL codes? When was your last tune up?

 

[dreamshare]

I do not know much about motors, I recenly fitted this motor in my car,I do not know what you mean about a code

 

[RonJ]

Click the CEL link in my signature.

When were your spark plugs, wires, cap, and rotor last replaced?

 

[dreamshare]

I dont think it was changed, I bought this motor from a dealer and I dont think that the mechanic who fitted the motor changed it.I tested the wires and the plugs and that seemed fine because I removed it one by one

 

[RonJ]

What do you mean tested? Did you also inspect the cap and rotor? Generally, when you purchase a used car, you should start by doing a tune up.

 

[dreamshare]

I removed the plug wires individually,as I removed them I started the car wit the one that was removed to determine if it is the plugs or the wires and its not that because when I removed them, there was a real bad so the miss that I have now is a slight one.I do not know how to inspect that

 

[RonJ]

I removed the plug wires individually,as I removed them I started the car wit the one that was removed to determine if it is the plugs or the wires and its not that because when I removed them, there was a real bad so the miss that I have now is a slight one.I do not know how to inspect that

1) Cranking or running the engine with a plug wire removed is one of the best ways to destroy or damage the ignition coil.

2) The test you did would miss a minor problem with the plugs, wires, cap, or rotor problem. You didn't learn anything by doing the test.