1991 LS400

[Lboogie]

Ive replaced my 1991 LS400 engine and had no issue until I put gas in as it sat for 18months , now there is a loss of power . Ive replaced the fuel filter and pump and dropped the tank and cleaned it with no change! Ive tried reading the codes both under the hood and the drivers seat! Can anyone help me with this issue 

[paulo57509]

You replaced the engine;

• Why did you replace the engine?
• What condition was the replacement engine in?
• Just a salvage yard, used engine swap?
• Did you swap parts from the original engine to the replacement engine?
• Did you do anything to the replacement engine before/after the swap?
• Scanned for codes; were their any?
• Describe "loss of power".
• Is loss of power constant or intermittent?
• Have you checked your fuel pressure?

[Bykfixer]

Did you clean the injectors (yet)?

[Lexus Owners Club]

Lboogie  any progress on this fault with the suggestions above?