Electrical issues

Asked by Jul 04, 2019 at 02:04 PM about the 1997 Ford Expedition

Question type: Maintenance & Repair

97 5.4 expedition. Started running rough. So
started by codes being read. Got 4 misfire 1..
misfire 3... crank postion...  cat... so.  
Replaced 1&3 ... replaced CPS. Cleared codes
and got the same except now it through in
tps. Ok replaced tps... I've left the cat alone
with the though that if 1 & 3 are truly passing
raw fuel down stream that would start the
code call out. Runs rough at idle  and the mis
is consistent driving but becomes
pronounced under demand especially at 2000
rpms. This leaves me with the question I'm I
having a wiring harness ghost issue? I'm I
having a computer issue? If it's a harness
how should I test to confirm or rule out? Or
I'm I missing the possible real problem?

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