I have 1990 F150 5.0 EFI with about 200K miles. Has had TP sensor problem for years, finally replaced it. Tuned up, new plugs, wires, cap and rotor. Checked idle air valve, reads 10.3 ohms, is not stuck or clogged. Fires up to idle barely then will not run. Started coming home from town, got rougher and rougher. Since then did tune-up, put in new TP sensor and checked idle air valve. HELP! Any ideas. Thought it might be fuel pump, but it checks out. Tried other tank, did not make any difference.

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