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Q:

the car was hardstarting so i replaced the camshaft positioning sensor... on 1990 Ford Thunderbird SC

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
now the car bucks and surges but it starts fine now
(2) Answers
(1) Comments
Your check engine light must be on. What are the trouble codes?
there is no trouble codes check engine light is not on...it ran great before i changed the cps but it was hardstarting...i changed all the plugs,wires and coil...no vacuum leaks were detected...all the old plugs were evenly worn no oil on them..compression was good on all 6 cylinders...i unplugged the cps and now it runs good again but is hardstarting again...and i do run premium gas in it...is it possible i bought a defunct cps
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Start with the basics, spark plugs good, no vacuum leaks,perhaps check compression is even in all cylinders, look at the old spark plugs see that they are all the same color, none are mechanically damaged or oil fouled.