problems at idle
 

Got a problem at Idle. All of a sudden two days ago the car seemed
to be missing and holding back. Had the leads and plugs changed...
(even though I paid a rx7 specialist to change the plugs whilst I
was on holiday..only to find out today that they had not been
changed at all!!!!!) Not "F" ing happy I can tell you)..quite a bit
better but now I have an irregular lump at the bottom end. Idle goes
from 750 to 1000rpm in milliseconds every ten seconds or so.....When
driving lets say for example at 2k you can see the tacho jump from 2
to 2.5 k but with no increse in engine speed:confused:

Anybody had a problem similar?

Thinking it might be a dodgy earth....could this cause it?


P.S no loss in power at all and no smoke or loss of collant.

P.P.S Not sure if its the map coz when the irregularity occurs ( ie
jumps) so does the injector duty.

Am I right in thinking that the ECU is telling the car it needs more
fuel hence the jump in RPM

HELP!
:confused:

check the tps