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5.4 engine issue

Old 08-22-2016, 03:20 PM
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Question 5.4 engine issue

So my 05 with 5.4 in it has recently started idling erratically when I slow down. It doesn't happen often but it will idle badly and has even died a few times.
I can put it in neutral and it will start back up with a slight puff of smoke.
It has also had a drop in MPG it gets about 10 at the moment. The motor has less than 10K miles on it and was replaced at a ford dealership. They did a block swap but i think all the accessories were swapped over. This issues happened about 3 months ago and i changed the throttle body and it seemed to fix it until now. It has no codes and this is the PID from the scanner:

DTC_CNT 0
FuelSYS1 CL
FUELSYS2
LOAD_PCT(%) 22.4
ECT c 87
SHRTFT1% 2.3
LONGFT1 1.6
SHRTFT2 –0.8
LONGFT2 1.6
RMP 649
VSS (KM) 0
SPARKADV 14.5
IAT c 52
MAF (G/S) 6.61
TP 12.9
O2B1S1 (V) 0.610
SHRTFT B1S1 5.5
O2B1S2 0.100
SHRTFTB1S2 NA
O2B2S1 0.680
SHRTFTB2S1 -.8
SHRTFT B2S2 99.2


any help would be greatly appreciated. Thanks in advance.


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