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Re: 4kq won't start follow-up

Start with the CIS electrical and vacuum stuff.  Look for
disconnections, bad grounds, dirt, whatever.  Measure everything
possible and compare to spec.  IMO, your fuel pump works or it doesn't. 
Why would it rev high and not low if the fuel pump was screwed up?  
BTW, I have noticed a substantial change once upon a time around 3k rpm
on my coupe (rougher above), fixing a few things made it go away. It's
like moving from one program to another, with one not working right, I

Try disconnecting the WOT switch, will it run well at high RPM now?  If
not, open loop was solving your problem and the CIS is bound to be the

Huw Powell