Slight miss fire @ 30 MPH

[markys]

Anything to worry about ?

[FourWheelDrift]

What gear does it happen in?

[markys]

2nd

[GCerbera]

Only in second?

Might be a spark lead breaking down, especially if the
problem comes and goes.

[YI8TVR]

you need a track day. Its got cobwebs. Kill or Cure.

Mine died...................

[markys]

Its in 3rd @ 2000 rpm not 2nd as I said earlier.

[jonnie5]

I understand it's fairly normal to have a bit of lumpiness around 2000 rpm, mine does - so I hope so!

Put it 2nd, sounds better!!

[RichardP]

Get the throttle pots settings checked with the MBE software. When these are set up correctly you should be able to drive at 30 in 4th quite smoothly.

[clarky5150]

Apparently if you have the inlet manifolds ported and flowed a noticeable flat spot appears around 2k revs. This is always present on the car, just accentuated after the work. Fool your friends that you have stage 1 tuning and leave it alone.....or check the throttle pots, leads etc. If you have an early chip it may be worth while changing to the later type. Better fuelling and protection for your starter motor. (obv the manifolds only apply to 4.2's)

[suffolkfox]

I agree with the previous comments re throttle pots, check with software if you have access to it as they can be 'noisy', but also check the range of the Lambda sensors at the same time. This should be up 0v to approx 1.4v but I had a problem with mine that turned out to be dirty contacts causing the reading to peak at 2.2v!! Apparently if they read up to 1.8v they don't set the MBE light off, but do cause hesitance/stuttering which is more noticeable at 2000 revs with no errors recorded.