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Q:

P0135, P0134, P0153, P1133, P0155 on 1998 Cadillac Seville STS

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I am experiencing somewhat sluggish acceleration. Not bad, but noticeable. The engine sounds louder at idle, no rough idle (that I can tell), but louder.

The codes I get are P0135 (most common), P1133, P0155, and P0134. I clear them and I can drive maybe 30 minutes highway and the P0135 returns all the time. The other codes are intermittent. I recently had my fuel pump replaced, but this issue existed before my old one died. However, when the fuel pump was replaced, I have been noticing a gasoline smell. The repair shop that installed it said it may be normal. Please assist
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On my car, the codes can be cleared by disconnecting the battery or resetting from the dash controls. Both have been done and the situation above exists.