Help diagnosing misfire issue please. Codes included.

[garrisonsheff]

Hi, I've got a 1995 gt and recently it started having what I think is a misfire type thing above 3000rpm. The car is also hard to start hot or cold but if I let the fuel pump prime after turning to key on for 10 seconds or so, it'll crank up normal. Theres no KOEO codes and the stored codes are 176 and 556 for lean on left bank o2 and fuel pump circuit respectively. What should I look into for trouble shooting and what would you recommend?

EDIT: Just wanted to add that it will do this hot and cold. And while driving or also just free revving it in neutral.

 

[RAU03MACH]

• Flexible Fuel (FF) sensor to Vehicle Power (VPWR) circuit harness open or shorted
• FF to VPWR circuit poor electrical connection
• Open in FF sensor signal circuit
• Short to ground in FF sensor signal circuit
• Fuel contamination

for code 176 possible cause

 

[garrisonsheff]

• Flexible Fuel (FF) sensor to Vehicle Power (VPWR) circuit harness open or shorted
• FF to VPWR circuit poor electrical connection
• Open in FF sensor signal circuit
• Short to ground in FF sensor signal circuit
• Fuel contamination

for code 176 possible cause

Is this the same as flex fuel (e80/85)? If so I wasn't aware this was a thing on these cars. What steps can I take to start further figuring out what may be causing it testing-wise?

 

[RAU03MACH]

check the egr hose track it back for any damage

 

[RAU03MACH]

check all grounds first and connections