Missing over 5000 revs

[colinrob]

Please can anyone help I have a 4.0 chimaera 1993 that will not rev cleaning over 5000, it has just been serviced, had a fast road cam fitted and also a Mark Adams chip, there is no power after 5000 and the only way to progress is change gear please can someone help!!!!!!!!!!
I have not tried optomax yet as it was full of fuel could try on monday as it will need some but has anyone else any ideas or is this normal?

[colinrob]

Thanks for the help I have just loosened the fuel cap to see if this helps (did not try it today as it was a bit slipy), will fill up with optamax tommorrow as well, when the car was serviced by peninsula they checked the HT leads etc said they were OK (only 350 miles ago)
I will let you know how I get on tommorrow

[colinrob]

Car now revs to 6000 (have'nt tried any higher and don't intend to), changed rotor arm, dist cap and plug extensions sounds lovely goes great very happy!!!!!!!!!!!
Changing HT leads anyway
PS optimax made no difference apart from in my wallet
Thanks everyone for the help
Colin

[colinrob]

Its not standard has a Mark Adams (best guess)chip and fast road cam but I won't be trying to go over 6000 its just so nice that it revs smoothly to that point!