Need help with code 25
hope some of you can help me out. I have a 88 s10 with 4 cyl. starts fine and runs good cold but when it warms up it starts stumbling and cutting out, its hard to keep it running. I changed spark plugs, cap, rotor, plug wires. It still throws code 25. Any Ideas ?
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1970 K-10 400CID, to much cam--not enough compression  Stan's Headers  and a 4" lift / 1990 R1500 Suburban 4X4, 350CID with vortec heads, edlebrock intake, TBI, 10:1 compression and Stan's Headers 
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