Help! 86 Riviera intermittent issue

[sowle]

Car intermittently runs rough. Walk away for another day and runs fine. No codes. Replaced oxy sensor for fun. Car only has 67k. Any ideas?

 

[bison]

Any codes? Probably ignition related. Coil, module, or wires

 

[pacecarta]

fuel pump going south
i popped a walbro 255lph in my 95 riv ,
its not hard job to pull the pump , you dont need to drain fuel and dont even need to raise car . just a couple screws on the cover in the trunk, push lock hoses, twist off the ring
I took apart the stock hanger unit and fit the walbro GN pump in there

fyi there is a 3800 forum here for these cars

 

[sowle]

Yes I didn't know where to post this issue. This car has a 3.8 it has plenty of fuel pres even while running. I'm spooked.

 

[sowle]

OK.. the ECM has been replaced with a reman- no difference. Fuel @Rail 37PSI. Changed TPS and car ran properly for only a short time. Car has a very high idle. What gives??????