1998 WR400 problem

I just buy a wr400 1998, pay $300.00 because the bike dont do any fire on the sparkplug but the rest of the bike is in great shape, I have find it was the TPS WHO GO WRONG because when I unplug it I got fire and the bike start... I have read in the forum some run whitout the tps..... but my probleme is the bike go well whit the choke on it when I remove it no iddle and it dont rev well before half of the trottle...... any idea ??

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