When i connected the diagnostic tool the code was 21 does it mean it still has problem with the vaccum leak or is it the problem with tps or ecm??

 

Code 21 is low TPS voltage. TPS could be misadjusted, shot, or wires could be shorting out.

I'd check the wires first.. when I bought my 88 it ran like hell and popped code 22 (high TPS voltage) because of the tps wires sitting on the valve cover and shorting when the engine was hot..

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'88 Camaro, hunter green metallic, T-top
LO3 305 TBI/700r4
Performance mods: None yet
Audio mods: still swapping..

'86 Camaro SC, black /w silver racing stripes
2.8l MPFI/700r4 /w special 2nd gear delete option
Misc Mods: Cut air box, '83 Firebird spoiler.
Performance Parts: Accel 8mm wires, SplitFire plugs, Gabriel hijackers.
Audio Mods: removing
My Homepage, with pics.

 

Yeah, if u don't know how to adjust the TPS there are articles on this homepage to help i believe.

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1988 305 TBI camaro. Flowmaster exhaust, 14x3 open air element, complete IROC-Z makeover (stripes, ground effects, interior...etc), Kenwood c.d. player, Sony Xplod 6x9's, Blaupunkt 3 1/2's.