RPM get spike

[mustangbasha]

Hi there

I have a strange problem with my 2007 V8 GT. After my car engine get cold i start moving car immediately car RPM get spike . E.g it goes from 1 RPM to 2.5 once i am moving more than 10 KM speed it is not spiking is that issue with the Trotter ?

[rupert]

Does RPM actually jumps up and down or only gauge dances? If its gauge then you know the answer (gauge is faulty). If not then get the proper engine tune up done and check spark plug and HT leads to start with.

[mustangbasha]

Hi Ruprt

It’s Really car is spiking, this case comes only when the engine is cold drive immediate, if the engine is left on for more than 4 minutes well it's fine no spike goes well smooth, you are right I guess this spark plug need to be replace it 100k now